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P6

LCD shows P6 - Freezing/overheating protection operation

MHI · Air Conditioning

What does P6 mean?

The remote controller LCD displays 'P6', indicating that either freezing protection (in cooling mode) or overheating protection (in heating mode) is currently active.

Common Causes

  • Restricted airflow around indoor or outdoor units.
  • Dirty air filters or heat exchangers.
  • Refrigerant issues (e.g., overcharge, undercharge, clog).

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check and clean the air filters of the indoor unit.

  2. 2

    Ensure there are no obstructions blocking airflow to the indoor and outdoor unit's heat exchangers.

  3. 3

    Verify that the indoor and outdoor fans are operating correctly.

  4. 4

    If the issue persists, a technician should check the refrigerant levels and system components.

Browse all codes in this manual (124)
Verified technical data. Last updated: April 2026

Related Faults

00Outdoor Board LED only green lights up after startup - No outdoor unit of address 0 / Remote controller transmission wire open1OPERATION INDICATOR lamp blinks 1 time (Pattern A) - Indoor/outdoor unit communication error (Transmitting error - Outdoor unit)14OPERATION INDICATOR lamp blinks 14 times (Pattern A) - Other errors
Source: MHI Air Conditioning
Open Manual (Page 18)Search more codes in this manual