Mitsubishi Heavy Error Codes
Every Mitsubishi Heavy error code we have catalogued, with what it means on site — 40 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 Heavy codes
- E1 — Remote control communication error
- E2 — Duplicate indoor unit address
- E3 — Outdoor unit signal line error
- E5 — Communication error during operation
- E6 — Indoor heat exchanger thermistor fault
- E7 — Indoor return air thermistor fault
- E9 — Drain water level fault
- E10 — Too many indoor units on one remote
| Code | What it means |
|---|---|
| E1 | Remote control communication error |
| E2 | Duplicate indoor unit address |
| E3 | Outdoor unit signal line error |
| E5 | Communication error during operation |
| E6 | Indoor heat exchanger thermistor fault |
| E7 | Indoor return air thermistor fault |
| E9 | Drain water level fault |
| E10 | Too many indoor units on one remote |
| E12 | Address setting error (mixed method) |
| E16 | Indoor fan motor fault |
| E19 | Indoor unload motor control mode fault |
| E28 | Remote control thermistor fault |
| E30 | Incompatible indoor–outdoor connection |
| E31 | Duplicate outdoor unit address |
| E32 | Open L3 phase on primary power supply |
| E36 | Discharge pipe temp error or liquid overflow |
| E37 | Outdoor heat exchanger / sub-cool thermistor fault |
| E38 | Outdoor air temp thermistor fault |
| E39 | Discharge pipe temp thermistor fault |
| E40 | High pressure fault |
| E42 | Compressor current cut-out |
| E43 | Over-connected indoor units / excess capacity |
| E45 | Inverter PCB–outdoor control PCB comm error |
| E46 | Mixed address setting methods on network |
| E48 | Outdoor DC fan motor fault |
| E49 | Low pressure fault |
| E53 | Suction pipe temp thermistor fault |
| E54 | High/low pressure sensor fault |
| E55 | Compressor under-dome thermistor fault |
| E56 | Power transistor temp thermistor fault |
| E58 | Compressor loss of synchronisation |
| E59 | Compressor start failure |
| E60 | Compressor rotor position detection failure |
| E61 | Main–backup outdoor communication error |
| E63 | Emergency stop |
| P1 | High pressure protection |
| P2 | Low pressure protection |
| P3 | Discharge temperature protection |
| P5 | Compressor over-current protection |
| P9 | Indoor heat exchanger frost/overheat protection |
Official Mitsubishi Heavy source / manual ↗
Frequently asked
What does Mitsubishi Heavy error code E1 mean?
Mitsubishi Heavy error code E1 means: Remote control communication error. In R-Pro you also get the likely causes and the inspection steps — offline.
What does Mitsubishi Heavy error code E2 mean?
Mitsubishi Heavy error code E2 means: Duplicate indoor unit address. In R-Pro you also get the likely causes and the inspection steps — offline.
What does Mitsubishi Heavy error code E3 mean?
Mitsubishi Heavy error code E3 means: Outdoor unit signal line error. In R-Pro you also get the likely causes and the inspection steps — offline.
What does Mitsubishi Heavy error code E5 mean?
Mitsubishi Heavy error code E5 means: Communication error during operation. In R-Pro you also get the likely causes and the inspection steps — offline.
What does Mitsubishi Heavy error code E6 mean?
Mitsubishi Heavy error code E6 means: Indoor heat exchanger thermistor fault. In R-Pro you also get the likely causes and the inspection steps — offline.
What does Mitsubishi Heavy error code E7 mean?
Mitsubishi Heavy error code E7 means: Indoor return air thermistor fault. In R-Pro you also get the likely causes and the inspection steps — offline.
What does Mitsubishi Heavy error code E9 mean?
Mitsubishi Heavy error code E9 means: Drain water level fault. In R-Pro you also get the likely causes and the inspection steps — offline.
What does Mitsubishi Heavy error code E10 mean?
Mitsubishi Heavy error code E10 means: Too many indoor units on one remote. 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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