[7-9 Error Code Definitions and Solutions: Codes [7000 — 7999] ]
7-9-2
1. Error code definition
Capacity code setting error
2. Error definition and error detection method
Connection of incompatible (wrong capacity code) indoor unit or outdoor unit
3. Error source, cause, check method and remedy
Error source
Outdoor unit
(1) The model name (capacity code) set by the
Indoor unit
switch (SW2) is wrong.
*The capacity of the indoor unit can be con-
firmed by the self-diagnosis function (SW1
operation) of the outdoor unit.
Outdoor unit
(2) The model selection switches (SW5-3 — 5-8)
on the outdoor unit are set incorrectly.
HWE14040
Cause
SW5
Model
3
4
5
6
P200 model
OFF ON OFF OFF
P250 model
ON
ON OFF OFF
P300 model
OFF OFF ON OFF
P350 model
OFF ON
ON OFF
P400 model
ON
ON
ON OFF
P450 model
OFF OFF OFF ON
P500 model
ON OFF OFF ON
Check method and remedy
1) Check the model name (capacity code) of the in-
door unit which has the error source address set
by the switch (SW2 on indoor unit board).
When the model name set by the switch is differ-
ent from that of the unit connected, turn off the
power source of the outdoor and the indoor units,
and change the setting of the capacity code.
Check the setting for the model selection switch
on the outdoor unit (Dipswitches SW5-3 — 5-8 on
the outdoor unit control board).
7
8
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON OFF
— 227 —
GB
Mitsubishi air conditioners are known for their high-quality performance and durability, but like any other appliance, they can experience issues over time. Here are the Mitsubishi air conditioner error codes that can help identify and fix common problems that may arise.
This guide will provide an overview of the common issues with Mitsubishi air conditioners, such as issues with the unit not turning on or producing cold air, unusual noises, or leaks. It will also offer some basic troubleshooting steps that users can take to diagnose and potentially solve these issues.
It is important to note that while some problems can be fixed easily by following simple troubleshooting steps, other issues may require professional assistance. Users should exercise caution when attempting to diagnose or repair their air conditioner and seek professional help. Overall, this Mitsubishi air conditioner error codes list can be useful for anyone who owns a Mitsubishi air conditioner and wants to ensure it operates effectively and efficiently.
Table of Contents
Mitsubishi AC Troubleshooting Guide
Please carry out the following checks before making a service call.
Models: DXK09Z5L-S, DXK12Z5L-S, DXK15Z5L-S
The air-conditioner does not work at all.
- Has the power switch been turned off?
- Has the timer been set in the “ON” position?
- Is there a power failure or a blown fuse?
Poor cooling or heating
- Have you set the thermostat at a suitable temperature?
- Is the air filter clean? (Not clogged?)
- Did you leave any doors or windows open?
Poor cooling
- Is there any direct sunlight entering the room?
- Is there a heat source in the room?
- Are there too many people in the room?
Models: SRK63ZM-S, SRK71ZM-S, SRK80ZM-S
Mitsubishi “E” Error Codes
| Code Text | Description | Cause | Check Procedure |
| E2 Error | Remote controller transmitting error. | Incorrect wiring of remote or incorrect dip switch setting if units are grouped. | Check unit addressing if grouped or check remote is only wired to the master indoor unit. |
| E4 Error | Remote controller transmitting error. | Incorrect wiring of remote or incorrect dip switch setting if units are grouped. | Check unit addressing if grouped or check remote is only wired to the master indoor unit. |
| E0 Error | Remote controller transmitting error. | Incorrect wiring of remote or incorrect dip switch setting if units are grouped. | Check unit addressing if grouped or check remote is only wired to the master indoor unit. |
| E5 Error | Remote controller communication/receiving an error. | The remote controller is incorrectly wired or the controller does not have the correct 12vdc supply.
Incorrect settings on SW1 switches at the outdoor unit. |
Check for 12vdc down to the controller and make sure LED 2 is lit on the FTC board.
Check the SW1 dip switches on the outdoor unit are set correctly. |
| E4 Error | Remote controller communication/receiving an error. | The remote controller is incorrectly wired or the controller does not have the correct 12vdc supply.
Incorrect settings on SW1 switches at the outdoor unit. |
Check for 12vdc down to the controller and make sure LED 2 is lit on the FTC board.
Check the SW1 dip switches on the outdoor unit are set correctly. |
| E8 Error | Comms Failure indoor to outdoor (S2/S3) | Mis-wiring of indoor to outdoor cable. The system powered up incorrectly. | Check for pumps wired in, Check the indoor isolator, and Repower in the correct sequence i.e. indoor than outdoor. |
| E9 Error | Comms Failure indoor to outdoor (S2/S3) | Mis-wiring of indoor to outdoor cable. The system powered up incorrectly. | Check for pumps wired in, Check the indoor isolator, and Repower in the correct sequence i.e. indoor than outdoor. |
| EF Error | Non-defined error code. | Noise interference. | Power down the system for 30 seconds and then switch back on. |
| E3 Error | Remote controller transmitting error. | Incorrect wiring of remote or incorrect dip switch setting if units are grouped. | Check unit addressing if grouped or check remote is only wired to the master indoor unit. |
| EA Error | Miswiring/communication error when more than 1 unit is connected in a group. | Miswiring/lose interconnecting cables. Noise interference. More than 1 unit in the same group is set as a master (address 0). | Check the wiring of interconnecting cables. Check master and slave addressing when more than 1 unit is connected in a group. |
Mitsubishi “A” Error Codes
| Code Text | Description | Cause |
Check Procedure |
| FA Error | 51CM connector open circuit. | A thermal relay is an open circuit | Check the thermal relay for disconnection or contact failure, possible defective board |
| A6 Error | Communication error with communication processor. | Lossnay address not transmitted. | Check M-Net voltage. |
| PA Error | Drain Fault.
The indoor unit detects high condensate levels before the unit has started running. |
Float switch activated by high water level. If the unit has a drain sensor then the resistance of the drain sensor has changed due to being immersed in water. | Check the water level in the drip tray – If full, then check drain pump operation, blockage in the drain pipe, and/or sludge or debris in the drip tray blocking the drain pump intake.
If the drip tray is empty, investigate why the unit believes it is full of water. Test the float switch for correct movement and measure continuity through the switch – open contact when OK and closed contact when in alarm. If the unit has a drain sensor instead of a float then test for correct resistance. Also, a check fault has not been generated from an external high-limit switch connected to either CN4F or CN31 on the indoor board. |
| A3 Error | The transmission line is busy when Mr.Slim is connected to the M-Net transmission line. | No data could be transmitted for 8 minutes. | Check A-MNET connections (TB7). |
| EA Error | Miswiring/communication error when more than 1 unit is connected in a group. | Miswiring/lose interconnecting cables. Noise interference. More than 1 unit in the same group is set as a master (address 0). | Check the wiring of interconnecting cables. Check master and slave addressing when more than 1 unit is connected in a group. |
| A0 Error | Duplicate address. | Units are attached with the same address. | Change the address and reset the unit’s power. |
| A7 Error | Communication error. A-Mnet wiring, range of transmission wiring exceeded, faulty A-MNET converter | A-Mnet wiring, range of transmission wiring exceeded incorrect M-net address setting, faulty A-Mnet converter. | Test M-net wiring. or Test M-net transmission voltage. Test the M-net address setting. Replace the A-Mnet converter. |
| A8 Error | M-Net no response/communication error. | The range of transmission wiring exceeded the faulty A-Mnet converter, the incorrect wire used for the Mnet connection. | Check A-Mnet wiring, cable type should be 2-core screened CY cable, 1.5mm. |
| EA Error | Communication fault between Indoor FTC and Outdoor Ecodan | Mis-wiring between indoor and outdoor on S1-S2-S3, power supply issue, or blown fuse | Check the voltage on interconnecting cable on S1-S2-S3, check 240v supply to indoor and outdoor, and check continuity on fuses |
| A2 Error | Hardware error of transmission processor (Lossnay). check comms wiring, possible Lossnay board fault | Error is detected when the waveform is transformed on transmission wiring. Possible Lossnay board fault. | Check comms wiring. |
Mitsubishi Air Conditioner Error Codes “F Series”
| Code Text | Description | Cause | Check Procedure |
| FA Error | 51CM connector open circuit. | A thermal relay is an open circuit | Check the thermal relay for disconnection or contact failure, possible defective board |
| F8 Error | No input was detected at the outdoor unit. | The outdoor board is defective. | Check mains power is ok. |
| F9 Error | Both High and Low-pressure switch open the circuit | Both high-pressure and low-pressure switches open the circuit or are incorrectly connected to the control board. Possible control board fault. | Check continuity through both switches and make sure the connections onto the board are secure. Make sure there is no damage to the cables connecting the switches to the board |
| UF Error | Compressor over-current fault.
High current detected within 30 seconds after compressor starts. |
Possible issues with the compressor such as compressor lock or winding failure,
Inverter board or inverter output failure, Faulty wiring between compressor and inverter board, Mains power supply incorrect, Blockage in the refrigerant circuit or stop valve closed |
Measure compressor winding resistance for a dead short/open circuit,
Carry out an inverter output test*, Check compressor wiring for damage, Test for correct mains voltage supply, Ensure the compressor is not trying to pump against a blockage/restriction in the refrigerant circuit |
| EF Error | Non-defined error code. | Noise interference. | Power down the system for 30 seconds and then switch back on. |
| F3 Error | Low-pressure switch open circuit or incorrect contact with the control board | Low-pressure switch detecting low refrigerant pressure in the outdoor unit or the contact of the switch has become disconnected/damaged | Check continuity through the low-pressure switch and connection onto the board, check refrigerant gas pressure or use SW2 dips to check T63HS |
| F7 Error | Phase detection circuit fault. | The power supply phase was reversed. | Check the power supply and swap two phases off. |
| UF Error | Compressor over current fault/ Power board issue | Compressor drawing too much current whilst operating, compressor seized/failed, power board outputting incorrect voltage. | Carry out an inverter output test to prove the power board is functioning correctly, monitor the current draw from the compressor during operation and make sure the compressor is pumping |
| F9 Error | Two or more protection devices are open circuits. | Contact failure of two components. | Check protection devices for disconnection or contact failure. |
| EF Error | Non-defined error code. | Noise interference in the outdoor unit. | Power down Ecodan for 30 seconds
then switch it back on. |
Mitsubishi Air Conditioner Error Codes “P Series”
| Code Text | Description | Cause | Check Procedure |
| P6 Error | Overheating at the heat exchanger. | Lack of water flow, the air in the system, flow rate incorrectly set, blockage, or pump problem. | Check the flow rate is correct for the outdoor unit and bleed any air out of the system. |
| P1 Error | Room sensor fault. | Faulty thermistor, loose wiring connection on the PCB, or sensor setting incorrect. | Check the thermistor for short or open circuits, and check the wiring connection. Check settings in the main controller, Initial settings>Room sensor settings> Sensor settings>Sensor setting, then change the sensing point from TH1 to main R/C or Room R/C depending on what type of thermostat you are using. |
| P9 Error | TH5 Fault. | TH5 is not connected, short or open circuit, also the FTC is not configured for heating only. | Check TH5 is connected correctly. |
| PA Error | Drain Fault.
The indoor unit detects high condensate levels before the unit has started running. |
Float switch activated by high water level. If the unit has a drain sensor then the resistance of the drain sensor has changed due to being immersed in water. | Check the water level in the drip tray – If full, then check the drain pump operation, blockage in the drain pipe, and/or sludge or debris in the drip tray block the ing drain pump intake.
If the drip tray is empty, investigate why the unit believes it is full of water. Test the float switch for correct movement and measure continuity through the switch – open contact when OK and closed contact when in alarm. If the unit has a drain sensor instead of a float then test for correct resistance. Also, a check fault has not been generated from an external high-limit switch connected to either CN4F or CN31 on the indoor board. |
| UP Error | Over-current fault. | Over-current detected after 30 seconds of operation. Compressor lock, faulty inverter output. | Carry out an inverter output test, and see how many amps the compressor is pulling when it goes running. |
| P5 Error | High condensate level in the drip tray. | Float switch activated by high water level. If the unit has a drain sensor then the resistance of the drain sensor has changed due to being immersed in water. | Check the water level in the drip tray and check to see if the float switch is a closed circuit. If the unit has a drain sensor then check the resistance of the drain sensor. |
| P8 Error | No temperature change at the plate heat exchanger. | Problems with the flow rate (too high), incorrect sizing of the system, and problems with the outdoor unit. | Check flow rate, temperature differences across the flow and return, and temps in the outdoor unit using SW2. |
| P9 Error | Indoor Pipe/coil thermistor fault (TH5).
PCB detects incorrect temperature reading from the thermistor. |
Faulty thermistor – dead short/open circuit.
Damaged thermistor cable or poor connection to PCB. PCB incorrectly reading thermistor value. |
Check the connection of the thermistor on the PCB and thermistor wiring.
Unplug the thermistor and test the resistance value – the correct reading can be determined using Thermistor Value Look Up in the app. The thermistor temperature type is ‘NORMAL’. If all the above are correct then replace the PCB. |
| P8 Error | No temperature change in the outdoor unit after 10 minutes of operation. | The temperature difference between the Pressure Transducer (T63Hs), the Inlet water Temp (TH32), the HEX Liquid Pipe Temp (TH6), and the Ambient Temp (TH7) is less than or equal to 2c. | Check for the correct flow rate. Check the correct positioning of all thermistors. Use SW2 on the outdoor unit control board to check the sensor readings. |
| P3 Error | System transmission error. | Communication fault between indoor units. | Possible comms fault between I/C and R/C could also be incorrect group or master/slave settings (check CN40, SW2, and SW6) |
Mitsubishi Air Conditioner Error Codes “U Series”
| Code Text | Description | Cause | Check Procedure |
| UL Error | 63L open circuit. | The low-pressure switch is an open circuit. | Check the continuity of 63L and check the connection on the board. |
| U2 Error | Ecodan High compressor discharge temperature | Discharge thermistor detecting abnormally high temperature during operation. Possible refrigerant leak or water flow issue. Also, check the dip switches are set correctly on the Ecodan unit | Use the SW2 dip switches on the Ecodan to read the discharge thermistor value and T63HS reading, and check airflow through the coil on the Ecodan, and water flow rate. Confirm the dip switches are set correctly on the Ecodan |
| UL Error | Low-Pressure Fault.
– R407c system: Low-pressure switch (63L) activated. – R410a system: No temperature difference detected between outdoor thermistors |
Possible refrigerant leak. Restriction or blockage in refrigerant circuit causing low side pressure to drop. Problem with the pressure switch or the mounting position of outdoor thermistors. | Check the system standing pressure for a complete gas loss. Check the system running pressures/temperatures to determine if the system is short of gas or if there is a restriction/blockage in the circuit – a restriction may show frosting where refrigerant expands – a blockage will show an increase in the high side and a drop on the low side.
R407c system: The low-pressure switch (63L) should be a normally open contact – Measure the switch for continuity, if the correct gas charge is present and the switch stays open contact then replace the switch. R410a system: Check thermistors are connected correctly to the pipework |
| UF Error | Compressor over-current fault.
High current detected within 30 seconds after compressor starts. |
Possible issues with the compressor such as compressor lock or winding failure,
Inverter board or inverter output failure, Faulty wiring between compressor and inverter board, Mains power supply incorrect, Blockage in the refrigerant circuit or stop valve closed |
Measure compressor winding resistance for a dead short/open circuit,
Carry out an inverter output test*, Check compressor wiring for damage, Test for correct mains voltage supply, Ensure the compressor is not trying to pump against a blockage/restriction in the refrigerant circuit |
| U1 Error | Ecodan High-pressure fault | Usually caused by abnormal water flow on the primary circuit. | Check the flow rate on the flow setter/sensor, check the operation of pumps and zone valves, check the water pressure and air in the primary water circuit |
| UP Error | Over-current fault. | Over-current detected after 30 seconds of operation. Compressor lock, faulty inverter output. | Carry out an inverter output test, and see how many amps the compressor is pulling when it goes running. |
| U4 Error | Ecodan unit thermistor fault | TH3/TH32/TH6/TH7/TH8 thermistor reading abnormal temperature value | Check resistance through thermistors and connection onto the board, use SW2 dip switches to check temperature readings |
| U6 Error | Over-current fault
Inverter board abnormality when over-current is detected |
Possible issues with the compressor such as compressor winding failure,
Inverter board or inverter output failure, Faulty wiring between the compressor and inverter board, Mains power supply is incorrect. |
Measure compressor winding resistance for a dead short/open circuit,
Carry out an inverter output test, Check compressor wiring for damage, Test for correct mains voltage supply. |
| U8 Error | Outdoor Fan Motor related issue | The fan motor seized or not operating correctly, the incorrect voltage from the control board to the fan motor, F5 fuse blown on the control board | Check fan motor rotation and resistance, test the voltage output of the control board on the fan connection, check continuity through the F5 fuse, and make sure the fan blade is not damaged or catching on any other component within the unit |
| U1 Error | HIGH-PRESSURE FAULT | A high-pressure switch (63H) activates during unit operation. | First, check for the correct flow rate on the flow setter. Check for any problems with water circulation such as pump failure, airlocks, or blockages. or Check for continuity on the high-pressure switch |
Mitsubishi LED Blinking Troubleshooting Guide
| Error Codes | Problems |
| LED- E0 | Transmitting/receiving signal error |
| LED- P1 | Intake air sensor problem |
| LED- P2 | Pipe sensor problem |
| LED- P4 | Drain sensor problem |
| LED- P5 | Malfunctioning of the drain overflow protecting mechanism |
| LED- P6 | Problems with the coil frost/overheating protection mode |
| LED- P3 | System error (transmitting/receiving signal) |
| LED- P7 | System error (address) |
| LED- P8 | Outdoor unit malfunction |
| Mr.Slim K-control | PUH-EK Outdoor unit |
| LED- ON | Operation status |
| LED- Flash | Check code display |
| LED- LD1 | LED- ON Compressor directive LED- Flash Reverse phase detect |
| LED- LD2 | LED- ON Heating directive LED- Flash Open phase detect |
| LED- LD3 | LED- ON During 63H1 operation LED- Flash Pipe sensor short/open |
| LED- LD4 | LED- ON Compressor ON LED- Flash High-pressure switch (63H2) operation |
| LED- LD5 | LED- ON Outdoor fan ON LED- Flash Over current relay (51CM) operation |
| LED- LD6 | LED- ON 4-way valve ON LED- Flash Thermal switch (26C) operation |
| LED- LD7 | LED- ON Bypass valve ON LED- Flash Thermistor (TH3) overheat protection |
| LED- LD8 | LED- ON Crankcase heater ON LED- Flash Defective input |
Mitsubishi Air Conditioner Error Codes Numerical
| Error Codes | Problem | Troubleshooting |
| 0403 Error Code | Serial communication error | Test the wiring between the main board and the inverter board. |
| 0900 Error Code | Test run | Test Dipswitch SW2-1 on the main control board. |
| 1102 Error Code | Discharge temperature prob. | Test the compressor’s running current. |
| 1301 Error Code | Low-pressure prob. | Test the system standing pressure for gas loss |
| 1302 Error Code | High-pressure prob. | Test for clogged filters or restricted coils. |
| 1500 Error Code | Refrigerant overcharge | Test for the excess refrigerant returning to the ODU through overcharging. |
| 2500 Error Code | Drain sensor submerge | Test the water pump and water flow rate. |
| 2502 Error Code | Drain pump prob. | Test the float switch for continuity. |
| 2503 Error Code | Drain sensor prob. | Test for a short circuit and replace the sensor if damaged. |
| 2600 Error Code | Water leakage | Test for water leakage on humidifier pipes. |
| 4102 Error Code | Open phase | Test power supply, wiring, and fuses. |
| 4106 Error Code | Transmission power supply prob. | Test wiring, input voltage, and broadband connection. |
| 4115 Error Code | Power supply signal sync error | Test mains power, fuses, and PCB connections. |
| 4116 Error Code | Motor/RPM error | Test the fan motor connections, confirm secure fixing, clear the debris, or replace the motor/circuit board. |
| 4220 Error Code | Abnormal bus voltage | Test mains supply and DC bus voltage. |
| 4225 Error Code | Low bus voltage | Test mains power and voltage at the diode stack. |
| 4230 Error Code | Heatsink overheat protection | Test for blockages in the air passage, inverter failure, or inverter fan prob. |
| 4240 Error Code | Overload protection | Test inverter balance and reduce airflow through the heat sink. |
| 4250 Error Code | Over current protection | Test for open and short circuits and repair them. |
| 4255 Error Code | Outdoor fan error | Test the voltage on the fan and motor windings for short circuits. |
| 4260 Error Code | Heatsink overheat protection at start-up | Replace the THHS thermistor if faulty. |
| 5101 Error Code | Temperature sensor prob. | Test for prob. address code, thermistor connections, and wiring. Otherwise, replace the PCB. |
| 5102 Error Code | Return air thermistor prob. | Test for connection issues and thermistor resistance and replace the sensors or circuit board. |
| 5110 Error Code | Outdoor inverter heatsinks thermistor error | Test for open/short circuits and disconnections from the PCB. |
| 5201 Error Code | Pressure sensor failure | Reconnect or replace the sensors. |
| 5301 Error Code | Current sensor failure | Replace the sensors if faulty |
| 5701 Error Code | Loose float switch connector | Test for correct float switch operations and external pumps. |
| 6201 Error Code | Remote controller issue | Replace the remote controller. |
| 6600 Error Code | Address overlap | Match the address with the broadband network. |
| 6601 Error Code | Polarity setting issue | Test for voltage issues and cable sizes. |
| 6602 Error Code | Transmission procedure hardware error | Test the controller and broadband connections, and replace the circuit board if required. |
| 6603 Error Code | Transmission line bus busy error | Test for faulty wiring and repair it. |
| 6606 Error Code | Communication failure | Test the PCB for defects. Reset the power. If the error persists, replace the PCB. |
| 6607 Error Code | No ACK error | Test for power supply, Loss nay address, cable length, and termination. |
| 6608 Error Code | No response error | Test and repair cable termination, length, and type of cables used. |
| 6831 Error Code | MA controller signal reception error | Test the remote, cable length, types of cable and connections. |
| 6832 Error Code | MA controller comms prob. | Test remote, cable length, types of cable used, and connections. |
| 6833 Error Code | MA controller comms prob. | Test error code 6832 solution |
| 6834 Error Code | MA controller signal reception error | Test error code 6832 solution |
| 7100 Error Code | Total capacity error | Add capacities of all indoor units and match them with the outdoor unit capacity. |
| 7101 Error Code | Capacity code setting error | Test for capacity dips in IDU and ODU. |
| 7102 Error Code | Wrong number of connected units | Test for voltage on the broadband set-top box and if you have connected the correct box. |
| 7105 Error Code | Address setting error | Test the address setting on the OC and BC. |
| 7106 Error Code | Attribute setting error | Ensure that the SW3-1 setting is on. |
| 7110 Error Code | Signal transmission error | Test for broadband connections. |
| 7111 Error Code | Remote controller sensor prob. | Test SW-1 on the IDU. |
| 7113 Error Code | Function setting error | Test the SW5-10 settings and SW6 settings. |
| 7117 Error Code | Model setting error | Test the dips, resistors, and thermistors. |
| 7130 Error Code | Incompatible unit combination | Test broadband wiring on the systems. |
Conclusion
In conclusion, a Mitsubishi air conditioner is a valuable investment for keeping your home comfortable during the hot summer months. However, even the best air conditioners can develop problems over time. Following the troubleshooting guide outlined in this blog, you can identify and potentially solve common issues with your Mitsubishi air conditioner.
Remember to exercise caution when attempting to diagnose or repair your air conditioner and seek professional help if necessary. Hope this Mitsubishi air conditioner error codes list and troubleshooting guide helps you and you find out the solution. thanks!
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— 34 —
6754
“Отклонение от нормы линии K – Отклонение от нормы датчика дренажа, срабатывание поплавкового реле уровня”
6755
“Отклонение от нормы линии K – Отклонение дренажного насоса от нормы”
6756
“Отклонение от нормы линии K – Образование льда на змеевике / срабатывание защиты от перегрева”
6757
“Отклонение от нормы линии K – Ошибка системы”
6758
“Отклонение от нормы линии K – Неисправность наружного блока, ошибка обмена данными между внутренним и наружным блоком”
6761
“Отклонение от нормы линии K – Отклонение термистора комнатной температуры от нормы”
6762
“Отклонение от нормы линии K – Отклонение от нормы термистора внутреннего змеевика, отклонение от нормы датчика температуры конденсации”
6763
“Отклонение от нормы линии K – Ошибка передачи/приема”
6764
“Отклонение от нормы линии K – Отклонение датчика дренажа от нормы”
6765
“Отклонение от нормы линии K – Отклонение дренажного насоса от нормы”
6766
“Отклонение от нормы линии K – Образование льда на змеевике / срабатывание защиты от перегрева”
6767
“Отклонение от нормы линии K – Неисправность наружного блока, ошибка обмена данными между внутренним и наружным блоком”
6771
“Отклонение от нормы линии K – Отклонение высокого давления от нормы, отклонение низкого давления от нормы”
6772
“Отклонение от нормы линии K – Функция термостата внутреннего блока, отклонение температуры на выходе от нормы,
срабатывание термостата корпуса, срабатывание максимальной токовой защиты”
6773
“Отклонение от нормы линии K – Срабатывание термостата пластины радиатора”
6774
“Отклонение от нормы линии K – Отклонение термистора наружного блока от нормы”
6775
“Отклонение от нормы линии K – Отклонение датчика давления от нормы, Ошибка обмена данными между внутренним и наружным блоком”
6776
“Отклонение от нормы линии K – Отключение по максимальному току”
6777
“Отклонение от нормы линии K – Ошибка системы”
6778
“Отклонение от нормы линии K – Норма”
6779
“Отклонение от нормы линии K – Избыток хладагента, отклонение напряжения от нормы, отклонение датчика CT от нормы”
6800
“Ошибка связи – Другие ошибки связи”
6801
“Ошибка связи – Ошибка связи V-контроль”
6810
“Ошибка связи – Ошибка связи пульта дистанционного управления блока”
6811
“Ошибка связи – Невозможно восстановить синхронизацию пульта дистанционного управления блока”
6812
“Ошибка связи – Сбой аппаратного обеспечения пульта дистанционного управления блока”
6813
“Ошибка связи – Ошибка определения значения разряда состояния связи пульта дистанционного управления блока”
6820
“Другие ошибки связи”
6821
“Другие ошибки связи – Линия передачи данных занята”
6822
“Другие ошибки связи – Отсутствует подтверждение связи”
6823
“Другие ошибки связи – Отсутствует отклик”
6824
“Другие ошибки связи – Ошибка приема данных”
6830
“Ошибка связи – Ошибка пульта дистанционного управления MA, ошибочное повторное задание адреса”
6831
“Ошибка связи – Отсутствует прием сигналов пульта дистанционного управления MA”
6832
“Ошибка связи – Невозможно восстановить синхронизацию пульта дистанционного управления MA”
6833
“Ошибка связи – Нарушение работы аппаратного обеспечения передачи/приема данных пульта дистанционного управления MA”
6834
“Ошибка связи – Ошибка определения стартового бита при обмене данными с пультом дистанционного управления MA”
6840
“Ошибка связи – Ошибка A-контроль, отсутствует обмен данными управления между внутренним и наружным блоком / ошибка приема данных”
6841
“Ошибка связи – Ошибка восстановления синхронизации обмена данными A-контроль между внутренним и наружным блоком”
6844
“Ошибка обмена данными A-контроль между внутренним и наружным блоком, неправильное подключение проводки
между внутренним и наружным блоком, чрезмерное количество внутренних блоков (более пяти)”
6845
“Ошибка связи – Ошибка обмена данными A-контроль между внутренним и наружным блоком, неправильное
подключение проводки между внутренним и наружным блоком (дистанционная связь, разъединение)”
6846
“Ошибка связи – Превышения максимального времени установления связи A-контроль между внутренним и наружным блоком”
7000
“Отклонение системы от нормы”
7100
“Отклонение системы от нормы – Ошибка общей производительности”
7101
“Отклонение системы от нормы – Код ошибки производительности”
7102
“Отклонение системы от нормы – Превышение максимального допустимого количества подключенных блоков”
7103
“Отклонение системы от нормы – Ошибка задания длины трубопроводов”
7104
“Отклонение системы от нормы – Ошибка задания высоты потолков”
7105
“Отклонение системы от нормы – Задан адрес выше 254”
7106
“Отклонение системы от нормы – Ошибка задания атрибута”
7107
“Отклонение системы от нормы – Ошибка настройки распределителя”
7108
“Отклонение системы от нормы – Ошибка настройки системы охлаждения”
7109
“Отклонение системы от нормы – Ошибка настройки соединения”
7110
“Отклонение системы от нормы – Неустановившийся режим соединения системы охлаждения / неустановившиеся данные соединения”
7111
“Отклонение системы от нормы – Входное/выходное оборудование не подключено / отклонение датчика пульта дистанционного управления от нормы”
7112
“Отклонение системы от нормы – Ошибка задания типа входов/выходов”
7113
“Отклонение системы от нормы – Оборудование не установлено”
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Mitsubishi Error Code 7101
Fault Code 7101: Capacity code setting error
-
Description
Fault Code 7101
Fault: Capacity code setting error
For Mitsubishi split and multi-split air conditioning systems included wall-mounted, duct-connected, console split, bulkhead, ceiling mounted and multi-head split units.
If molded case circuit breakers or earth leakage circuit breakers have tripped, do not reset the breaker immediately without first checking for any problems with insulation of equipment.
Resetting breakers without a check of insulation may cause damage to equipment.
Related errors
Today we are please to offer the complete list of Mitsubishi aircon error codes. No matter you want to troubleshoot your own Mitsubishi air conditioner or troubleshooting for clients, this mitsubishi ac troubleshooting guide will help.
Let’s get started with Mitsubishi electric air conditioner error codes first.
Mitsubishi error code 0403 (Serial communication error)
Cause : The fault occurs when there is a communication issue between PCB’s in the outdoor unit. If the model number is YGMA, YHMA, YJMA, YKMA or YLMA then the issue can be between the main board and inverter board or main board and fan board.
Check Procedure :
Check for poor connections and broken wiring between the boards. If the model number is YGMA, YHMA, YJMA, YKMA or YLMA, check the error detail code using the dip-switches section of the app to determine which PCB’s the transmission fault is with. If the detail code is 1, then the issue is between the main board and inverter board.
If the detail code is 5 then the issue is between the main board and fan board. Then check for poor connections between the PCB’s.
Technical Support Notes:
If there are no loose connections on either PCBs and the voltages are good then the Fan or Inverter PCB is usually at fault. This is not normally a problem with the main PCB.
Correct testing should allow you to identify which of the 2 boards is the cause. The online document link will take you to the document library where Service Handbooks can be viewed.
Mitsubishi error code 0900 (Test run)
Cause : Test operation dipswitch on the Lossnay circuit board has been set ON.
Check Procedure :
Check the position of Dipswitch SW2-1 on the main control board. If test is not required then set the dip switch to OFF.
Mitsubishi error code 1102 (Discharge temperature fault)
Cause : Insufficient cooling of the compressor caused by lack of refrigerant or a restriction in the refrigerant circuit, high ambient running conditions or airflow problems on either indoor or outdoor unit (depending on running mode), over heating of compressor through increased friction (compressor beginning to seize), faulty thermistor reading.
Check Procedure :
Use the testing dip switches in the app and check the system running pressures/temperatures and determine if the system is short of gas or if there is a restriction in the circuit – a restriction may show frosting where refrigerant expands, this could be a blocked strainer, faulty expansion valve operation or perhaps moisture in the system.
Check compressor running current -if higher than expected this could show a compressor issue.
Mitsubishi error code 1301 (Low pressure fault)
Cause : Possible refrigerant leak. Restriction or blockage in refrigerant circuit causing low side pressure to drop. Problem with pressure sensor reading incorrectly.
Check Procedure :
Check the system standing pressure for a complete gas loss.
Use the Testing dip switches in the app and compare system gauge pressure to Low Pressure Sensor reading – If the pressure sensor is faulty it will read 0.0 bar even though there is pressure in the system.
Technical Support Notes :
Using the testing dip switches check the system running pressures/temperatures to determine if the system is short of gas or if there is a restriction/blockage in the circuit.
For refrigerant circuit diagram click the link below and type unit model number into the document library search box
Mitsubishi error code 1302 (High pressure fault)
Cause : High pressure faults are commonly caused by a blocked condenser coil, faulty fan motor, a restriction of airflow on indoor units in heating mode or a blockage/restriction in the pipework.
Check Procedure :
Check outdoor fan operates correctly, ensure no restriction of airflow across indoor/outdoor coils such as clogged filters. Use the testing dip switches in the app to check system running pressures/temperatures – This may help highlight any blockages or restrictions in the refrigerant circuit such as faulty solenoid valves or check valves stuck closed.
Technical Support Notes :
If the you reset the unit and the fault generates straight away (without running) then the high pressure switch or sensor may be at fault. Measure the switch for continuity (normally closed) and use the dip switches to check the pressure sensor reading against your gauge pressure.
Mitsubishi error code 1500 (Refrigerant overcharge)
Cause : Normally caused by excessive refrigerant returning to the outdoor unit which over-cools the compressor. System is either over-charged or there are valves operating incorrectly allowing refrigerant to ‘flood’ back to the compressor.
Check Procedure :
Check correct reading of high pressure sensor and discharge thermistor. Check for excessive refrigerant returning to the outdoor unit through overcharge of gas, incorrect valve operation in the system or issue with linear expansion valve (LEV) control in BC Box or Indoor unit
Technical Support Notes :
An indoor LEV stuck open can be an obvious cause to this issue. Try running the system in full cooling and then checking if there is an indoor unit that performs much better than the others.
Mitsubishi error code 2500 (Drain sensor submergence)
Cause : Water pump off/faulty. Water flow rate too slow. Float switch faulty.
Check Procedure :
Check water pump. Check water flow rate. Check continuity of float switch.
Mitsubishi error code 2502 (Drain pump fault)
Cause : The indoor unit drain float has detected a high water level in the drip tray.
Check Procedure :
Check the indoor drip tray for water. If there is excessive water then there may be an issue with the internal pump or drains. If the tray is dry or hasn’t enough water to lift the float switch then check the float switch for continuity. If the switch is lifted the circuit should be made. If the switch is down then the circuit should be open.
Technical Support Notes :
The internal lift pump is not activated by the float switch, the pump is activated when cooling mode is selected. This fault is triggered by the float switch circuit closing.
Mitsubishi error code 2503 (Drain sensor fault)
Cause : The drain sensor is open/short circuit.
Check Procedure :
If the drip tray is clear then check the resistance of the drain sensor as an open circuit or short circuit can cause the fault.
Technical Support Notes :
Check the wiring diagram to see if the indoor unit has a float switch or sensor. If the wiring diagram shows a float switch and not a sensor check the dip switch settings for the unit model you are working on.
Mitsubishi error code 2600 (Water leakage)
Cause : Water leak from pipes on humidifier.
Check Procedure :
Check that water does not leak from pipes in humidifier.
Mitsubishi error code 4102 (Open phase)
Cause : Missing main phase.
Check Procedure :
Check power supply and noise filter for correct 3 phase, check wiring and fuses.
Mitsubishi error code 4106 (Transmission power supply fault)
Cause : Transmission (M-Net), incorrect wiring.
Check Procedure : Check wiring, high current, incorrect voltage on transmission line and/or M-Net board. Make sure M-net transmission wiring is daisy chained.
Mitsubishi error code 4115 (Power supply signal sync error)
Cause : Incorrect power supply, blown fuses or possible faulty PCB.
Check Procedure :
Check mains power is correct, check the fuses, and connections PCB.
Mitsubishi error code 4116 (RPM error/Motor error)
| Cause | Check Procedure |
|---|---|
| Faulty connection of a fan. | Check the connection for the fan motors. |
| Faulty connection of the leads between the Control board and the Power board. | Check the connections between the Control board and the Power board. |
| Model selection switch SW6 is set incorrectly. | Confirm that the model selection switch SW6 is set correctly for the model. |
| Ambient temperature in which the unit is located is high. | Check the temperature around the Lossnay. |
| Fan isn’t fixed correctly. | Confirm that the fan motors are fixed securely. |
| Deformed centrifugal fan. | Check that the centrifugal fan is clear of debris. |
| Centrifugal fan has foreign objects in or around it. | Replace the fan motor. |
| Fan motor fault. | Replace the circuit board. |
| Circuit board fault. | Check the connections of the reactor (TB3-4) and check the resistance of it. |
| Faulty connection of the reactor. | To identify which fan the issue is with, check the LED flashing sequence and contact After Sales Technical Support. |
Mitsubishi error code 4220 (Abnormal bus voltage)
Cause : Low mains power supply, diode fault.
Check Procedure :
Check mains supply. Check DC bus voltage coming from diode.
Mitsubishi error code 4225 (Low bus voltage)
Cause : Incorrect mains supply or fan board fault.
Check Procedure :
Check mains power is ok and there is at least 300vdc at the diode stack.
Technical Support Notes :
Check to see if the error led is lit on the fan board, this is a good indication that the fan board is the issue.
Mitsubishi error code 4230 (Heatsink overheat protection)
Cause : Blockage in air passage of inverter heatsink, Inverter board failure, inverter fan failure.
Check Procedure :
Check blockages in air duct failure of INV fan or failure of thermistor.
Mitsubishi error code 4240 (Overload protection)
Cause : If high current is detected for more than 10mins.
Check Procedure :
Check inverter balance. Reduced airflow through heat sink.
Mitsubishi error code 4250 (Over current protection)
Cause : High amps drawn by the compressor or an issue with the inverter.
Check Procedure :
Carry out an inverter output test to check if the inverter is working correctly. Use the “inverter testing guide” in the City Multi section of the APP. If the inverter is ok then check the compressor windings for a short or open circuit.
Technical Support Notes :
Use the service dipswitches on the outdoor unit to get the detail code which will indicate if the issue is with the inverter or compressor.
Mitsubishi error code 4255 (Outdoor fan error)
Cause : Grounding fault of fan motor or fan board fault.
Check Procedure :
Check the voltage on CNVDC on the fan. This should be a high DC voltage around 580vdc.
Also check the fan motor windings for an open or short circuit.
Technical Support Notes :
Use the service dipswitches on the outdoor unit to get the detail code which will indicate if the issue is with the fan board or fan motor.
Mitsubishi error code 4260 (Heatsink overheat protection at startup)
Cause : Reduced airflow through heat sink.
Check Procedure :
Fan motor problem. THHS thermistor problem.
Mitsubishi error code 5101 (Temperature sensor fault)
| Cause | Check Procedure |
|---|---|
| Faulty thermistor – dead short/open circuit. | The fault can be related to indoor or outdoor so check the fault code for address of unit in fault first. |
| Damaged thermistor cable or poor connection to PCB. | Check connection of thermistor on PCB and thermistor wiring. |
| PCB incorrectly reading thermistor value. | Unplug thermistor and test resistance value. |
If all the above are correct then replace the PCB.
Technical Support Notes :
Correct reading of thermistor can be determined using Thermistor Value Look Up in the app.
Check whether the thermistor is for reading High temperature e.g .Discharge, or Normal running e.g. Ambient/Liquid, to determine which range to check against.
Mitsubishi error code 5102 (Return Air thermistor fault)
Cause : The circuit board cannot read the thermistor correctly
Check Procedure :
Check the connection onto the circuit board.
Check the resistance of the thermistor.
Replace the thermistor.
Replace the circuit board.
Mitsubishi error code 5110 (Outdoor inverter heatsink thermistor error)
Cause : Reduced airflow through inverter heatsink.
Check Procedure :
Open/short circuit sensor, disconnected from PCB.
Technical Support Notes :
On the YGM-A series this can be either THHS1 or THHS5. To find out which it is you will need to check the inverter detail code using SW1 on the control board. Turn on SW1 dips 1,2,5,6,8 and look at the display for the code to be retrieved. THHS1=01 and THHS5=05.
Mitsubishi error code 5201 (Pressure sensor fault)
Cause : PS1 Pressure fault.
Check Procedure :
Check pressure reading using the dipswitches on the outdoor. Check connection of PS3 on PCB.
Mitsubishi error code 5301 (Current sensor fault)
Cause : ACCT or DCCT sensor error.
Check Procedure :
Check inverter error details, check resistance of current sensor, check connections of sensors.
Mitsubishi error code 5701 (Loose float switch connector)
Cause : The indoor unit internal float switch connector has detected an open circuit.
Check Procedure :
Check the float switch is operating correctly. If the switch is down then the switch should be open.
Also check for external pumps wired in across the fail safe connection.
Technical Support Notes :
This fault normally occurs when an external pump is wired in across the fail safe connections, (CN4F/CN31) and the external pump has failed. Or the connection is loose.
Mitsubishi error code 6201 (Remote controller issue)
Cause : The remote controller is faulty
Check Procedure :
Replace the controller.
Mitsubishi error code 6600 (Address overlap)
Cause : There is more than one unit with the same MNET address or two or more devices are addressed the same.
Check Procedure :
Check the address set on each device on the same MNET network.
Check address settings on outdoors, indoors, BC boxes and remote controllers to see if two have the same address settings.
Technical Support Notes :
This is only caused when two items are addressed the same. If they all look like they are set correctly power the system down and spin the address dials all the way around to confirm they are clicked into the position they should be. If the system also has a 6607 fault this could indicate where the repeat address has occurred.
Mitsubishi error code 6601 (Polarity setting error)
Cause : No voltage or short circuit on M-Net transmission line TB7.
Check Procedure :
Check TB7 connections on outdoors and central controllers. Check for voltage on TB7. Check cable size and spec.
Mitsubishi error code 6602 (Transmission processor hardware error)
| Cause | Check Procedure |
|---|---|
| Noise interference. Polarity problem on TB7. | Check M-Net connection on TB7 and central controller. Check cable size/spec. |
| Controller where the error originally occurred is defective. | Check the controller where the error occurred and replace if required. |
| Lossnay circuit board is defective. | Replace the circuit board. |
Mitsubishi error code 6603 (Transmission line bus busy error)
Cause :
Power is supplied to the same transmission cable from two or more power supply units.
The power supply unit is connected to TB3 side of the power supply expansion units.
The power supply units connected to the indoor and outdoor transmission cables.
Check Procedure :
Adjust the wiring of the power supply unit.
Mitsubishi error code 6606 (Communication fault)
Cause :
Poor connection of MNET terminals.
MNET cables have been terminated whilst the unit is powered.
Malfunction of the unit PCB.
Check Procedure :
Check that the MNET cables have been terminated correctly.
Reset power to the system.
Inspect the Control Board for damage.
Replace the Control Board.
Mitsubishi error code 6607 (No ACK error)
Cause :
Lossnay has no power.
Lossnay address has been changed.
Transmission cable is in excess of 500m.
Transmission cable is not securely terminated.
Check Procedure :
Check the power supply to the Lossnay.
Check the Lossnay address.
Check the cable length.
Check the cable termination.
Technical Support Notes :
The 6607 fault should also give you the address of the item in fault, if it does check power and M-Net voltage at the item.
If no address is given with the fault code then this is referred to as a “ghost fault”, this is caused when something with an address is physically removed from the system without being deleted first.
Mitsubishi error code 6608 (No response error)
Cause :
When using multiple Lossnay units, the Main/Sub switch has not been set.
Interference on the transmission line.
Cable length is in excess of 500m.
Transmission cable is not securely connected.
Multi core cable is being used for multiple uses and causing interference.
Check Procedure :
Isolate power and set the lead unit to Main using SW1 and the remaining units to Sub.
Check and repair cable terminations.
Check the length of the transmission cable.
Check that the cable used is as specified.
Mitsubishi error code 6831 (MA controller signal reception error)
Cause : MA controller being wired into the M-Net. Wrong cable size/spec.
Check Procedure :
Check where remote is wired to, check cable length no bigger than 500 meters, check connection and type of cable used, check R/C not set Sub on field settings.
Mitsubishi error code 6832 (MA controller comms fault)
Cause : MA controller being wired into the M-Net. Wrong cable size/spec.
Check Procedure : Check where remote is wired to, check cable length no bigger than 500 meters, check connection and type of cable used, check R/C not set Sub on field settings.
Mitsubishi error code 6833 (MA controller comms fault)
Cause : MA controller being wired into the M-Net. Wrong cable size/spec.
Check Procedure :
Check where remote is wired to, check cable length no bigger than 500 meters, check connection and type of cable used, check R/C not set Sub on field settings.
Mitsubishi error code 6834 (MA controller signal reception error)
Cause : MA controller being wired into the M-Net instead of the remote terminals. Wrong cable size/spec.
Check Procedure :
Check where remote is wired to, check the cable length is no bigger than 500 meters, check connection and type of cable being used, check R/C not set Sub on field settings.
Technical Support Notes :
This is usually caused when an M-Net controller is replaced with an MA controller. Make sure if you have an M-Net remote it is wired into the M-Net terminals and if you have an MA remote it is wired into the remote controller terminals.
Mitsubishi error code 7100 (Total capacity error)
Cause :
The total indoor unit capacity exceeds the outdoor unit allowable capacity.
On a PURY outdoor you are allowed up to 150% of its capacity.
On a PUHY/PUMY outdoor you can have up to 130% of its capacity.
Check Procedure :
Add up all the capacities of the indoor units and check they don’t exceed the outdoor unit capacity.
Also check the capacity dip switches on the indoor and outdoor unit are set correctly.
Technical Support Notes :
This fault can be caused when the system is comprised of two outdoor units piped together and power is lost to one of the outdoors.
Mitsubishi error code 7101 (Capacity code setting error)
Cause : SW2 set wrong on indoors, SW5 dips set wrong on YHM-A outdoor, SW3-10 on older kit.
Check Procedure :
Capacity dips on indoor and outdoor units.
Mitsubishi error code 7102 (Wrong number of connected units)
Cause : The outdoor unit is not seeing any indoor units or it is seeing more than the allowable value.
Check Procedure :
Check voltage on M-Net, power to the BC box, check dip switches are set correctly on the BC box and the model type of BC box is correct for the system.
Technical Support Notes :
Check the voltage on the M-Net at the outdoor unit (it should be 29vdc). If there is no voltage then power down and remove the M-Net and check the terminals again. If you then get 29vdc then there is an issue somewhere on the M-Net, a loose connection or short maybe.
Mitsubishi error code 7105 (Address setting error)
Cause : OC or BC addressed wrong.
Check Procedure :
Check address setting on OC and BC.
Mitsubishi error code 7106 (Attribute setting error)
Cause : GUF unit being used on City Multi system.
Check Procedure :
Make sure SW3-1 setting is on, on the GUF.
Mitsubishi error code 7110 (Signal transmission error)
Cause : Loose or misswiring of TB3 or TB7. SW5 dip 7 not set on outdoor. Transmission booster turned off.
Check Procedure :
Check M-Net connections, dipswitches on outdoors.
Mitsubishi error code 7111 (Remote controller sensor fault)
Cause : SW1 – 1 on and no controllers fitted or faulty remote controller.
Check Procedure :
Check SW1 – 1 on the indoor unit if no remote controllers fitted.
Mitsubishi error code 7113 (Function setting error)
Cause :
More than 1 unit in the group is set to as the Main Lossnay (SW5-10 ON)
The group contains two or more units with the same address.
The Lossnay that is set to the Main, has not been set to the lowest unit address in the group.
The MA remote controller for the air conditioner (Mr.Slim or City Multi) is connected to the Lossnay.
Incorrect wiring of the remote controller terminals.
The Lossnay LGH-RVX is in the same group as a Lossnay LGH-RX5.
The model selection switch SW6 is not set correctly.
Check Procedure :
Check the SW5-10 setting on the Lossnays in the same group and confirm that there is only one set to Main(ON)
Check the address settings of the Lossnay units.
Change the remote for a PZ-61DR-E.
Check that the wiring of the remote terminals and the MNET terminals.
The LGH-RVX and the LGH-RX5 cannot be used in the same group.
Confirm that the SW6 setting is correct for the model.
Mitsubishi error code 7117 (Model setting error)
Cause : SW5 set wrong on the outdoor or wrong resistors fitted.
Check Procedure :
Check dips, resistors and thermistors.
Mitsubishi error code 7130 (Incompatible unit combination)
Cause : Check split with MAC 399 wired onto the TB5 line not the TB7.
Check Procedure :
Check M-Net wiring on systems.
Now, let’s proceed with Mitsubishi heavy air conditioner error codes. If you want to learn more about Mitsubishi heavy vs electric, please refer to our previous guide for more info.
Mitsubishi error code E1 (Remote controller communication issue)
Cause : Faulty controller or poor wiring connection/abnormal voltage to the Remote controller
Check Procedure :
Check the remote controller wiring connection onto the FTC terminals and ensure there is 12vdc down to the Remote controller.
Make sure LED2 is lit on the FTC Control board
Mitsubishi error code E2 (Remote controller transmitting error)
Cause : Incorrect wiring of remote or incorrect dip switch setting if units are grouped.
Check Procedure :
Check unit addressing if grouped or check remote is only wired to master indoor unit.
Mitsubishi error code E3 (Remote controller communication/receiving error)
Cause :
Incorrect settings on SW1 switches at the outdoor unit.
Poor connection or wiring of the remote controller.
Check Procedure :
Check for 12vdc down to the controller and make sure LED 2 is lit on the FTC board
Check the SW1 dips switches on the outdoor unit are set correctly.
Mitsubishi error code E5 (Remote controller communication/receiving error)
Cause :
Remote controller incorrectly wired or the controller does not have the correct 12vdc supply.
Incorrect settings on SW1 switches at the outdoor unit.
Check Procedure :
Check for 12vdc down to the controller and make sure LED 2 is lit on the FTC board.
Check the SW1 dips switches on the outdoor unit are set correctly.
Mitsubishi error code E6 (Indoor to outdoor communication fault)
Cause : Loss or no communication between the FTC and outdoor Ecodan. Poor connection of the interconnecting cable or not the correct 12-24vdc fluctuating voltage between S2 and S3.
Check Procedure :
Reset power supply to both indoor FTC and outdoor Ecodan. Power back up the indoor first then the outdoor. Check interconnecting cable connections and voltages. Check indoor FTC LEDs.
Technical Support Notes :
The most common cause of an E6 fault is external noise interference caused by condensate pumps being wired into S1 & S2. If a pump is wired in to S1 & S2 and you have an E6, then try disconnecting the pump and repowering the system to see if it works.
Mitsubishi error code E7 (Comms failure indoor to outdoor)
Cause : Mis-wiring of indoor to outdoor cable. System powered up incorrectly.
Check Procedure :
Check for pumps wired in, Check indoor isolator, Repower in correct sequence i.e. indoor then outdoor.
Mitsubishi error code E8 (Indoor to Outdoor communication error)
Cause : Loss or no communication between the FTC and outdoor Ecodan. Poor connection of the interconnecting cable or not the correct 12-24vdc fluctuating voltage between S2 and S3.
Check Procedure :
Reset power supply to both indoor FTC and outdoor Ecodan. Power back up the indoor first then the outdoor. Check interconnecting cable connections and voltages. Check indoor FTC LEDs.
Mitsubishi error code E9 (Indoor to outdoor communication error)
Cause :
Loss or no communication between the FTC and outdoor Ecodan. Poor connection of the interconnecting cable or not the correct 12-24vdc fluctuating voltage between S2 and S3.
SW8-3 set to OFF when independent power supplies are used.
Check Procedure :
Reset power supply to both indoor FTC and outdoor Ecodan. Power back up the indoor first then the outdoor. Check interconnecting cable connections and voltages. Check indoor FTC LEDs.
Power down complete system and set SW8-3 to ON before powering the FTC before the Ecodan.