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Upper lamp 6-time blink

Upper OPERATION INDICATOR lamp blinks 6 times — Outdoor unit thermistor trouble

Mitsubishi Electric · MSZ-AY Air Conditioners

What does Upper lamp 6-time blink mean?

The upper lamp on the indoor unit blinks 6 times. This indicates a problem with a thermistor located in the outdoor unit, which measures temperatures crucial for efficient operation.

Common Causes

  • Malfunction of an outdoor unit thermistor

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 attempt a reset.

  2. 2

    If the problem persists, contact a service technician to check the outdoor thermistors.

  3. 3

    Do not attempt to operate the unit if the problem continues.

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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