Mitsubishi Error Code P2: Indoor Pipe Thermistor Error
Warning: Your Mitsubishi HVAC system has detected an issue with the indoor pipe thermistor. It's safe to keep running, but you should schedule a professional repair soon.
LED Blink Pattern
How to Fix Mitsubishi Code P2
- Check if the indoor unit is receiving power
- Inspect the wiring harness for any visible damage
- If you're comfortable, clean the thermistor gently with a soft brush
How to Reset Mitsubishi Code P2
- 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 P2 Mean?
The P2 error code on your Mitsubishi HVAC system indicates a problem with the indoor pipe thermistor. This component measures the temperature of the refrigerant as it enters the indoor unit. If it's not working properly, your system might not cool or heat correctly. The most common causes are a faulty thermistor or a problem with the wiring.
Common Causes
- Faulty indoor pipe thermistor
- Wiring issue between the thermistor and the main circuit board
- Incorrect thermistor installation
- Dirt or debris blocking the thermistor
Diagnostic Steps
| If... | Check | Expected |
|---|---|---|
| Indoor unit is not running | Measure the resistance of the thermistor using a multimeter | Between 5kΩ and 20kΩ, depending on the model |
| Thermistor resistance is out of range | Inspect the wiring harness for any visible damage or corrosion | No damage or corrosion |
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 |
|---|---|---|---|
| Indoor Pipe Thermistor | 520030-0000 | — | Find Part |
| Wiring Harness | 520031-0000 | — | Find Part |
Related Codes on Same Models
Other codes that affect the same Mitsubishi model families as P2.
| Code | Description | Severity |
|---|---|---|
| 1 | Indoor/Outdoor Mismatch | Warning |
| 2 | Power Supply Phase Error | Warning |
| 3 | Communication Error | Warning |
| 4 | Inverter Error | Warning |
| 5 | Outdoor Thermistor Open/Short | Warning |
| 6 | Indoor Freeze/Overheat | Warning |
| 7 | Outdoor Freeze/Overheat | Warning |
| E6 | Indoor/Outdoor Communication Error | Warning |
| E9 | Indoor/Outdoor Communication Fault | Warning |
| P1 | Intake Sensor Error | Warning |