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Left/Upper lamp blinks 3-time blink, 2.5-second OFF

Left/Upper lamp blinks 3 times with a 2.5-second pause — Indoor fan motor fault

Mitsubishi Electric · Air Conditioning

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

The indoor fan motor is not sending a rotational frequency feedback signal during operation. This means the fan might not be spinning correctly or at all.

Common Causes

  • Indoor fan motor not operating
  • Faulty rotational frequency feedback signal from the fan motor
  • Loose connection to the indoor fan motor

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the indoor fan motor connection (CN211).

  2. 2

    Refer to section 10-6 for detailed checks of the indoor fan motor.

  3. 3

    If the motor is faulty or connections are bad, it may need replacement.

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
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