P8

Outdoor Unit Malfunction

Mitsubishi Electric · R410A Systems

What does P8 mean?

The outdoor unit has reported a general malfunction. This is a broad error indicating an issue within the outdoor unit that requires further investigation, as a specific fault code for the outdoor unit may not be directly displayed on the indoor remote controller.

Repair Steps

  1. 1

    Check the outdoor unit's display or LEDs for more specific fault codes or diagnostic indicators.

  2. 2

    Verify stable power supply to the outdoor unit's main terminals.

  3. 3

    Inspect the outdoor unit PCB for any visible damage, tripped protection devices, or abnormal component temperatures.

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Verified technical data. Last updated: March 2026
Source: Mitsubishi Electric R410A Systems