Mitsubishi · Mini-split
P1 Intake or thermistor sensor fault
What this code means
The sensor that reads room temperature at the indoor unit isn't functioning correctly.
Most likely causes
- Damaged or disconnected thermistor wiring
- Failed sensor
What to try first
Power-cycle the unit; if the code returns, the intake sensor typically needs replacing.
Good news: this one is often fixable without a service call. If it persists after the steps above, have it looked at.
Find the part on Amazon →FAQ
What does Mitsubishi error code P1 mean?
Intake or thermistor sensor fault. The sensor that reads room temperature at the indoor unit isn't functioning correctly.
Can I fix Mitsubishi code P1 myself?
Often, yes. Power-cycle the unit; if the code returns, the intake sensor typically needs replacing.
What causes Mitsubishi code P1?
The most common causes are: damaged or disconnected thermistor wiring; failed sensor.
Other Mitsubishi mini-split codes
All Mitsubishi mini-split error codes →
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This information may contain errors or not apply to your exact model — always double-check it against your appliance's own manual before acting. If there's any chance of a gas, fire, electrical, carbon monoxide, or other safety hazard, stop and call a licensed professional or the appropriate agency (e.g. your gas utility) instead of relying on this page alone.