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Upper lamp 5-time blink

Upper OPERATION INDICATOR lamp blinks 5 times — Outdoor power system abnormality

Mitsubishi Electric · MSZ-AY Air Conditioners

What does Upper lamp 5-time blink mean?

The upper lamp on the indoor unit blinks 5 times. This indicates an abnormality in the outdoor unit's power system, potentially affecting components like the inverter or compressor.

Common Causes

  • Abnormality in the outdoor unit's power system
  • Issues with the outdoor unit's inverter or compressor

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the unit's main power supply, wait a few minutes, then turn it back on to see if the issue resolves.

  2. 2

    If the problem persists, contact a service technician to check the outdoor unit's power system, inverter, and compressor.

  3. 3

    Do not attempt to operate the unit if the problem continues, to prevent further damage.

Browse all codes in this manual (43)
Verified technical data. Last updated: April 2026

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Source: Mitsubishi Electric MSZ-AY Air Conditioners
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