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ErrorLib — Industrial Fault Code Library

Disclaimer: ErrorLib is an independent technical reference tool. While we aim for accuracy, always verify with the manufacturer’s official service manuals before performing maintenance on industrial equipment. ErrorLib is not affiliated with the brands listed.

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.

Common Causes

  • Overheating of the outdoor unit components.
  • Refrigerant pressure issues (too high or too low).
  • Electrical fault within the outdoor unit.
  • Fan motor failure in the outdoor unit.
  • Compressor malfunction.

Repair Steps & Checklist

Click steps to track your progress.

  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.

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

Related Faults

E0Transmitting/Receiving Signal ErrorE112Auto Addressing Conflict / Factory Address Setting ErrorE14Master/Slave System Configuration Error
Source: Mitsubishi Electric R410A Systems
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