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Upper lamp 5-time blink

Operation Indicator Lamp 5 Blinks - Outdoor Power System Abnormality

Mitsubishi Electric · MSZ-AP Air Conditioners

What does Upper lamp 5-time blink mean?

The upper lamp of the indoor unit's Operation Indicator blinks five times in a pattern. This signifies an abnormality in the outdoor unit's power system, which could affect its operation.

Common Causes

  • Outdoor power system abnormality.
  • Potential issue with inverter or compressor.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn OFF the main power supply to the air conditioner.

  2. 2

    Check the outdoor unit for any visible signs of damage or loose connections.

  3. 3

    Ensure the circuit breaker supplying power to the outdoor unit has not tripped. If it has, reset it.

  4. 4

    Turn the main power supply back ON. If the blinking continues, contact a qualified service technician to check the outdoor unit's power system and components.

Browse all codes in this manual (87)
Verified technical data. Last updated: April 2026

Related Faults

3 Min Restart DelayUnit cannot be operated for about 3 minutes after restart - Microprocessor protection3 Short Beeps3 short beeps from indoor unit - Weekly timer setting failedAP Mode activatedNET and MODE LEDs flashing (every 5 seconds) - Access Point Mode activated
Source: Mitsubishi Electric MSZ-AP Air Conditioners
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