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1 red flash

1 red flash — Indoor unit fan motor issue

Mitsubishi Electric · Air Conditioning

What does 1 red flash mean?

A single red flash from the operation indicator lamp usually points to a problem with the indoor fan motor. This could be a short or open circuit within the motor.

Common Causes

  • Short circuit in the indoor fan motor.
  • Open circuit in the indoor fan motor.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the power supply to the unit.

  2. 2

    Disconnect the indoor fan motor connector (CN211) from the control board.

  3. 3

    Measure the resistance of the indoor fan motor using a tester.

  4. 4

    If the resistance indicates a short or open circuit (refer to manual for specific values), replace the indoor fan motor.

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 45)Search more codes in this manual