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OPERATION INDICATOR 3 blinks

OPERATION INDICATOR lamp blinks 3 times — Indoor fan motor error

Mitsubishi Electric · MSZ-AY Air Conditioners

What does OPERATION INDICATOR 3 blinks mean?

The indoor unit's upper lamp blinks three times, indicating that the rotational frequency feedback signal is not being emitted during indoor fan operation. This suggests a problem with the indoor fan motor.

Common Causes

  • Indoor fan motor failure
  • Issue with the rotational frequency feedback signal
  • Loose or disconnected wiring to the indoor fan motor

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Refer to 'Check of indoor fan motor' section (10-6) in the full manual.

  2. 2

    Turn OFF the power supply to the unit at the circuit breaker and wait a few minutes before turning it back on.

  3. 3

    If the error persists, a qualified technician should inspect the indoor fan motor and its connections.

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

Related Faults

AIR PURIFYING lamp 2 blinksAIR PURIFYING lamp blinks 2 times — Front panel not firmly closed or interlock switch issueAIR PURIFYING lamp 2-time blinkAIR PURIFYING lamp blinks 2 times — Air Purifying device error (real-time)AIR PURIFYING lamp continuous blinkAIR PURIFYING lamp continuously blinks — Air purifying device dirty, wet, or malfunction
Source: Mitsubishi Electric MSZ-AY Air Conditioners
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