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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.

08

Abnormal Power Synchronous Signal

Mitsubishi Electric · PUZ-HA30/36NHA4 Outdoor Unit

What does 08 mean?

An abnormality is detected in the power synchronous signal, which is crucial for the controller circuit board to synchronize with the incoming power frequency. A faulty signal can lead to unstable operation of power components and incorrect timing control.

Common Causes

  • Abnormal signal detected in the power synchronization process.
  • Phase imbalance in the incoming power.
  • Faulty power supply board.
  • Issues with the synchronizing circuitry.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the controller circuit board for any visible damage or component failure.

  2. 2

    Check the connections related to power sensing on the controller circuit board.

  3. 3

    Verify the stability and frequency of the incoming power supply.

Browse all codes in this manual (45)
Verified technical data. Last updated: April 2026

Related Faults

01Overvoltage Error02Undervoltage Error04L1 or L2-Phase Open Error
Source: Mitsubishi Electric PUZ-HA30/36NHA4 Outdoor Unit
Open Manual (Page 68)Search more codes in this manual