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P1: Intake Air Temperature Sensor Error (Mitsubishi)

Mitsubishi heat pump indoor intake air temperature sensor is reading outside valid range.

What This Error Code Means

The room temperature sensor on the indoor unit has failed, affecting temperature control.

Common Causes

  • Sensor wiring damaged
  • Thermistor failed open or short
  • Dirty sensor blocked by dust
  • Sensor disconnected from PCB
  • Control board input circuit failure

Affected Brands

Mitsubishi

How ROMA Heating Fixes This

  • Clean the intake thermistor
  • Check sensor wiring and connections
  • Measure sensor resistance vs temperature
  • Replace failed thermistor
  • Verify accurate temperature readings

Why Trust ROMA Heating

24/7 Emergency

True round-the-clock service including weekends and holidays

Licensed Technicians

TSBC licensed and trained on all major heat pump brands

Fast Diagnosis

We know exactly how to interpret and resolve error codes

Related Services

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