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POWER lamp blink 0.5s + Beep

Indoor POWER lamp blinks every 0.5 seconds with a beep — Air Purifying device abnormal (recall function)

Mitsubishi Electric · MSZ-AY Air Conditioners

What does POWER lamp blink 0.5s + Beep mean?

When you activate the AIR PURIFYING power failure mode recall function, the indoor POWER lamp blinks at 0.5-second intervals, accompanied by a beep. This indicates an abnormality in the air purifying device.

Common Causes

  • An abnormal condition has been detected in the air purifying device.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Note the blinking pattern displayed by the POWER lamp.

  2. 2

    Refer to the 'Table of AIR PURIFYING power failure mode recall function' (section 10-2.5) for specific fault details.

  3. 3

    Release the failure mode recall function by turning off the main power supply and turning it on again, or by pressing the remote controller's RESET button.

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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