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P2

P2 - Pipe sensor abnormal

Mitsubishi Heavy Industries · R410A Systems

What does P2 mean?

A pipe sensor, likely measuring refrigerant temperature on a pipe within the indoor unit, is reporting an abnormal condition. This affects the system's ability to monitor refrigerant flow.

Common Causes

  • Faulty pipe sensor.
  • Loose or damaged wiring to the sensor.
  • Refrigerant leak affecting pipe temperature.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the air conditioning unit at the main power supply.

  2. 2

    Wait for 30 seconds, then turn the power back on.

  3. 3

    If the error continues, contact a qualified technician to diagnose the pipe sensor and refrigerant system.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

E0E0 - Transmitting/receiving signal errorE12E12 - Auto address setting error or unit addressed at factory settingE14E14 (Flashes 3 times) - Master/slave system control wiring error
Source: Mitsubishi Heavy Industries R410A Systems
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