Mitsubishi Electric Error Codes
Every Mitsubishi Electric error code we have catalogued, with what it means on site — 38 codes in total. In R-Pro, tap any code to get the meaning, likely causes and inspection steps, even with no signal in the plant room.
Common Mitsubishi Electric codes
- A0 — Duplicate address (Lossnay same address)
- A2 — Transmission processor hardware error (Lossnay)
- A3 — Line busy, no data for 8 minutes
- A6 — Communication error with communication processor
- A7 — No ACK signal
- A8 — M-Net no response
- EA — Mis-wiring / loose cables / noise interference
- EB — Mis-wiring / noise / wrong cable spec
| Code | What it means |
|---|---|
| A0 | Duplicate address (Lossnay same address) |
| A2 | Transmission processor hardware error (Lossnay) |
| A3 | Line busy, no data for 8 minutes |
| A6 | Communication error with communication processor |
| A7 | No ACK signal |
| A8 | M-Net no response |
| EA | Mis-wiring / loose cables / noise interference |
| EB | Mis-wiring / noise / wrong cable spec |
| EC | Start-up time over (failed to initialise) |
| ED | Serial communication error |
| E0 | Remote controller communication error |
| E1 | Remote controller issue |
| E3 | Remote controller not transmitting |
| E4 | Remote controller not receiving |
| E6 | Indoor/outdoor communication error |
| E7 | Comms fault between indoor and outdoor |
| E8 | Comms failure indoor↔outdoor (S2/S3) |
| F1 | Reverse phase detection |
| F2 | L3 phase open |
| F3 | 63L (low pressure switch) open |
| F5 | 63H (high pressure switch) open |
| F7 | Phase detection circuit fault |
| F8 | No input detected at outdoor unit |
| F9 | Two or more protection devices open |
| P1 | Return air thermistor fault (TH1) |
| P2 | Liquid pipe thermistor fault (TH2) |
| P4 | Drain sensor fault |
| P5 | High condensate level |
| P6 | Indoor heat exchanger freezing/overheating |
| P8 | Abnormal pipe temperature |
| P9 | TH5 condenser/evaporator thermistor open/short |
| U1 | High pressure trip |
| U2 | High discharge temperature |
| U3 | Discharge thermistor fault |
| U4 | Outdoor thermistor fault |
| U5 | Inverter heat sink temperature too high (TH8) |
| U6 | Compressor over-current |
| U7 | Low discharge superheat |
Official Mitsubishi Electric source / manual ↗
Frequently asked
What does Mitsubishi Electric error code A0 mean?
Mitsubishi Electric error code A0 means: Duplicate address (Lossnay same address). In R-Pro you also get the likely causes and the inspection steps — offline.
What does Mitsubishi Electric error code A2 mean?
Mitsubishi Electric error code A2 means: Transmission processor hardware error (Lossnay). In R-Pro you also get the likely causes and the inspection steps — offline.
What does Mitsubishi Electric error code A3 mean?
Mitsubishi Electric error code A3 means: Line busy, no data for 8 minutes. In R-Pro you also get the likely causes and the inspection steps — offline.
What does Mitsubishi Electric error code A6 mean?
Mitsubishi Electric error code A6 means: Communication error with communication processor. In R-Pro you also get the likely causes and the inspection steps — offline.
What does Mitsubishi Electric error code A7 mean?
Mitsubishi Electric error code A7 means: No ACK signal. In R-Pro you also get the likely causes and the inspection steps — offline.
What does Mitsubishi Electric error code A8 mean?
Mitsubishi Electric error code A8 means: M-Net no response. In R-Pro you also get the likely causes and the inspection steps — offline.
What does Mitsubishi Electric error code EA mean?
Mitsubishi Electric error code EA means: Mis-wiring / loose cables / noise interference. In R-Pro you also get the likely causes and the inspection steps — offline.
What does Mitsubishi Electric error code EB mean?
Mitsubishi Electric error code EB means: Mis-wiring / noise / wrong cable spec. In R-Pro you also get the likely causes and the inspection steps — offline.
Look up any error code — offline — in R-Pro.
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