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Upper lamp blinks 3-time blink 2.5-second OFF

Upper lamp blinking three times — Indoor fan motor signal issue

Mitsubishi Electric · Air Conditioning

What does Upper lamp blinks 3-time blink 2.5-second OFF mean?

This indicates that the rotational frequency feedback signal is not being emitted during indoor fan operation. The unit will not run.

Common Causes

  • Indoor fan motor not sending feedback signal
  • Faulty indoor fan motor
  • Loose connection to indoor fan motor

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Refer to the section 'Check of indoor fan motor'.

  2. 2

    Inspect the indoor fan motor for damage or obstructions.

  3. 3

    Ensure the indoor fan motor connector is securely attached.

Browse all codes in this manual (170)
Verified technical data. Last updated: April 2026

Related Faults

0.5-second ON / 0.5-second OFF blinkUpper lamp blinks 0.5-second ON/OFF - Miswiring or serial signal error00Normal operation - No error codes1 beep during error display mode1 beep during error display mode - Unit has an error (different code)
Source: Mitsubishi Electric Air Conditioning
Open Manual (Page 38)Search more codes in this manual