Mitsubishi Error Code P6: Coil Freeze/Overheat Protection
Warning: Your Mitsubishi HVAC system has detected a potential issue with the coil, which could lead to system damage if not addressed.
LED Blink Pattern
How to Fix Mitsubishi Code P6
- Check and replace your air filter if it's dirty
- Ensure that all vents are open and unobstructed
- If the issue persists, contact a professional HVAC technician for further diagnosis
How to Reset Mitsubishi Code P6
- Turn off the unit using the remote control or wall controller.
- Turn off the circuit breaker for the outdoor and indoor units. Wait 60 seconds.
- Restore power at the breaker.
- Turn the unit on with the remote control. If the error returns, the fault needs professional diagnosis.
Resetting clears the code from the display but does not fix the underlying fault. If the code returns after reset, proceed to the diagnostic steps above.
What Does Mitsubishi Error Code P6 Mean?
The P6 error code on your Mitsubishi HVAC system indicates that the coil freeze/overheat protection feature has been activated. This could be due to a blockage in the airflow, a refrigerant leak, or a malfunctioning sensor. The system has temporarily shut down to prevent further damage. It's important to address this issue promptly to avoid potential system failure.
Common Causes
- Blockage in the airflow, such as a dirty air filter or blocked vents
- Refrigerant leak, which can cause the coil to freeze or overheat
- Malfunctioning temperature sensor, which may not be accurately reading the coil temperature
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| System has been running for more than 15 minutes | Temperature of the suction line | Below 40°F (4°C) for cooling, above 100°F (38°C) for heating |
| Suction line temperature is abnormal | Pressure reading at the service ports | Normal pressure reading for your system |
Applicable Mitsubishi Models
- City Multi (VRF)(electric)
- City Multi (Y)(electric)
- Diamond (PJ)(electric)
- Diamond Plus(electric)
- Diamond Series(electric)
- Ducted Systems(electric)
- M-Series(electric)
- MSZ(electric)
- MSZ Series(electric)
- MSZ-AP(electric)
- MSZ-AP Series(electric)
- MSZ-AP5 Series(electric)
- MSZ-AS(electric)
- MSZ-FD(electric)
- MSZ-FE(electric)
- MSZ-FS(electric)
- MSZ-FS/FD Series(electric)
- MSZ-FT(electric)
- MSZ-FY(electric)
- MSZ-GE(electric)
- MSZ-LV(electric)
- MUZ-FE Series(electric)
- P-Series(electric)
- PUMA(electric)
- PUMY(electric)
- Puff (P-Series)(electric)
Replacement Parts
| Part | OEM Number | Est. Cost | Where to Buy |
|---|---|---|---|
| Temperature sensor | 500-000-000-000 | — | Find Part |
| Air filter | — | — | — |
Related Codes on Same Models
Other codes that affect the same Mitsubishi model families as P6.
| Code | Description | Severity |
|---|---|---|
| 1 | Indoor/Outdoor Mismatch | Warning |
| 2 | Power Supply Phase Error | Warning |
| 4 | Inverter Error | Warning |
| 7 | Outdoor Freeze/Overheat | Warning |
| E6 | Indoor/Outdoor Communication Error | Warning |
| E9 | Indoor/Outdoor Communication Fault | Warning |
| P2 | Indoor Pipe Thermistor Error | Warning |
| P4 | Drain Sensor Error | Warning |
| U2 | Low Voltage/Overcurrent | Warning |
| U3 | Discharge Thermistor Short/Open | Warning |