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Upper lamp 14+ time blink

Upper OPERATION INDICATOR lamp blinks 14 or more times — Other outdoor unit abnormality

Mitsubishi Electric · MSZ-AY Air Conditioners

What does Upper lamp 14+ time blink mean?

The upper lamp on the indoor unit blinks 14 or more times. This indicates a general or unspecified abnormality in the outdoor unit, which could stem from various issues including thermistor problems.

Common Causes

  • Various possible outdoor unit abnormalities not covered by specific codes
  • Problems with outdoor unit thermistors

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.

  2. 2

    If the problem persists, contact a service technician for a detailed diagnosis.

  3. 3

    The technician may need to use the 'Flow chart of the detailed outdoor unit failure mode recall function' and check all thermistors.

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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