Mitsubishi Electric air conditioning systems are renowned for their ultra-quiet operation and cost-effective performance, offering significant savings on both installation and running costs.
Mitsubishi Electric Error Codes List:
City Multi Systems:
- 403:Communications fault between boards. Check the inverter error details to identify the specific boards involved, and inspect the transformer, bus voltage, and interconnecting cables.
- 900:The Lossnay unit is in a test run.
- 1102:Compressor discharge temperature is too high (exceeded 110°C). This may indicate a refrigerant shortage or a discharge thermistor issue.
- 1301:Low pressure fault detected before starting. Inspect thermistors (TH2, TH3, TH4), refrigerant charge, indoor fan, heat exchanger, and filters.
403:Communications fault between boards. Check the inverter error details to identify the specific boards involved, and inspect the transformer, bus voltage, and interconnecting cables.
900:The Lossnay unit is in a test run.
1102:Compressor discharge temperature is too high (exceeded 110°C). This may indicate a refrigerant shortage or a discharge thermistor issue.
1301:Low pressure fault detected before starting. Inspect thermistors (TH2, TH3, TH4), refrigerant charge, indoor fan, heat exchanger, and filters.
Mr. Slim P Series (A-Control):
- A0:Green LED – 2 flashes, Red LED – 5 flashes, Controller 6600: Lossnay units have the same address. Change the addresses and reset the unit.
- A2:Green LED – 2 flashes, Red LED – 5 flashes, Controller 6602: Transmission processor hardware error. Check communications wiring and the Lossnay board for faults.
- A6:Green LED – 2 flashes, Red LED – 5 flashes, Controller 6606: Communication error with the communication processor. Check the M-Net voltage.
- E0:Green LED – 2 flashes, Red LED – 3 flashes: Communication error with the remote controller. Verify wiring, voltage, and connections. If multiple systems are connected, check the master/slave settings.
A0:Green LED – 2 flashes, Red LED – 5 flashes, Controller 6600: Lossnay units have the same address. Change the addresses and reset the unit.
A2:Green LED – 2 flashes, Red LED – 5 flashes, Controller 6602: Transmission processor hardware error. Check communications wiring and the Lossnay board for faults.
A6:Green LED – 2 flashes, Red LED – 5 flashes, Controller 6606: Communication error with the communication processor. Check the M-Net voltage.
E0:Green LED – 2 flashes, Red LED – 3 flashes: Communication error with the remote controller. Verify wiring, voltage, and connections. If multiple systems are connected, check the master/slave settings.
Mr. Slim P Series (K-Control):
- E0:System transmission error. There could be a communication fault between the indoor and remote controllers.
- P4:Drain sensor fault. Check the drain sensor resistance and connections.
- P5:Drain fault. High levels of condensate detected; inspect for blockages in the drain, tray, or possible pump failure.
- P7:System error due to an address setting fault.
E0:System transmission error. There could be a communication fault between the indoor and remote controllers.
P4:Drain sensor fault. Check the drain sensor resistance and connections.
P5:Drain fault. High levels of condensate detected; inspect for blockages in the drain, tray, or possible pump failure.
P7:System error due to an address setting fault.
Additional Common Error Codes:
- P1:Intake sensor error.
- P2 – P9:Pipe (liquid or 2-phase) sensor error.
- E6 – E7:Indoor/outdoor unit communication error.
- PA:Forced compressor error.
- P6:Freezing/overheating safeguard operation.
- EE:Communication error between indoor and outdoor units.
- P8:Pipe temperature error.
- E4:Remote controller signal receiving error.
- Fb:Indoor unit control system error (memory error, etc.).
- E1 – E3:Remote controller transmission error.
- E9:Indoor/outdoor unit communication error (transmitting error) in the outdoor unit.
- UP:Compressor overcurrent interruption.
- U3 – U4:Open/short circuit of outdoor unit thermistors.
- UF:Compressor overcurrent interruption (when compressor is locked).
- U2:Abnormal high discharging temperature or insufficient refrigerant.
- U1 – Ud:Abnormal high pressure or overheating safeguard operation.
- U5:Abnormal temperature of heat sink.
- U8:Outdoor unit fan safeguard stop.
- U6: Compressor overcurrent interruption
P1:Intake sensor error.
P2 – P9:Pipe (liquid or 2-phase) sensor error.
E6 – E7:Indoor/outdoor unit communication error.
PA:Forced compressor error.
P6:Freezing/overheating safeguard operation.
EE:Communication error between indoor and outdoor units.
P8:Pipe temperature error.
E4:Remote controller signal receiving error.
Fb:Indoor unit control system error (memory error, etc.).
E1 – E3:Remote controller transmission error.
E9:Indoor/outdoor unit communication error (transmitting error) in the outdoor unit.
UP:Compressor overcurrent interruption.
U3 – U4:Open/short circuit of outdoor unit thermistors.
UF:Compressor overcurrent interruption (when compressor is locked).
U2:Abnormal high discharging temperature or insufficient refrigerant.
U1 – Ud:Abnormal high pressure or overheating safeguard operation.
U5:Abnormal temperature of heat sink.
U8:Outdoor unit fan safeguard stop.
U6: Compressor overcurrent interruption
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