Mitsubishi Mini-Split Error Codes
Error code guides for Mitsubishi mini-split systems (M-Series / P-Series / Hyper Heat). Select your error code for step-by-step diagnosis.
Mitsubishi error code index
- E6 Error CodeCommunication error between indoor and outdoor units
- P8 Error CodeOutdoor over/under-temperature protection
- E7 Error CodeIndoor/outdoor communication (transmission) error
- P6 Error CodeFreeze-up protection / ice on coil
- E4 Error CodeRemote controller signal-receiving error
- Not Cooling But RunningUnit runs but produces no cold air
Before you start: quick resets
Many Mitsubishi faults are triggered by a power fluctuation or temporary condition and will clear on a reset. Turn off the unit at the thermostat, cut power at the breaker for 60 seconds, restore power, then turn the unit back on. If the error returns immediately, the fault is real and you need to diagnose it. If it clears, run the unit for 30 minutes to confirm stability.
If the code returns or never clears: find your specific code in the list above for a targeted diagnosis guide.