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Left/Upper lamp 3-time blink

Left/Upper lamp blinks 3 times — Indoor fan motor fault

Mitsubishi Electric · Air Conditioning

What does Left/Upper lamp 3-time blink mean?

This indicates a problem with the indoor fan motor. The unit may not operate normally.

Common Causes

  • Indoor fan motor malfunction
  • Indoor fan motor connection issue
  • Feedback signal error from fan motor

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the indoor fan motor. Refer to section 10-6, 'Check of indoor fan motor'.

  2. 2

    Inspect the connection of the indoor fan motor.

  3. 3

    Replace the indoor fan motor if it is determined to be faulty.

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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