CodeRegistry
Brands
  1. Home
  2. Mitsubishi Electric
  3. MSZ-FH Air Conditioners
  4. POWER lamp 4-time flash - Normal Troubleshooting
About·Privacy·Terms

CodeRegistry — Your global library for technical solutions.

For your safety: always follow the equipment manufacturer’s official manuals. CodeRegistry is an independent help site and is not affiliated with the brands listed here.

POWER lamp 4-time flash - Normal Troubleshooting

POWER lamp 4-time flash — Indoor unit control system trouble (normal troubleshooting)

Mitsubishi Electric · MSZ-FH Air Conditioners

What does POWER lamp 4-time flash - Normal Troubleshooting mean?

During normal operation troubleshooting, the POWER lamp flashes four times. This indicates a problem with the indoor unit's control system, specifically relating to its electronic control P.C. board.

Common Causes

  • Indoor electronic control P.C. board malfunction
  • Data read error from nonvolatile memory

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn OFF the power supply to the unit for a few minutes, then turn it back ON to attempt a reset.

  2. 2

    If the issue persists, contact an authorized service technician for diagnosis.

  3. 3

    This typically requires replacing the indoor electronic control P.C. board.

Browse all codes in this manual (41)
Verified technical data. Last updated: April 2026

Related Faults

3-minute delayCompressor does not restart immediately — 3-minute time delay activeAIR PURIFYING lamp 2-time flashAIR PURIFYING lamp flashes 2 times — Air purifying power supply issue or front panel not closedAIR PURIFYING lamp 2-time flash - CircuitAIR PURIFYING lamp 2-time flash — Air purifying power control circuit error
Source: Mitsubishi Electric MSZ-FH Air Conditioners
Open Manual (Page 23)Search more codes in this manual