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Indoor Green LED Off or On continuously

Indoor Green LED Off or On continuously — Indoor circuit board or CPU failure

Mitsubishi Heavy Industries · Air Conditioners

What does Indoor Green LED Off or On continuously mean?

The indoor unit's green LED is either continuously off or continuously on, suggesting a problem with the indoor unit's circuit board or central processing unit (CPU).

Common Causes

  • Indoor circuit board failure
  • Indoor CPU failure

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the main power supply to the air conditioner for at least 5 minutes, then restore power.

  2. 2

    Observe if the LED pattern changes after the power reset.

  3. 3

    If the issue persists, this typically indicates an internal component failure requiring professional service.

  4. 4

    Contact a qualified technician for diagnosis and repair of the indoor unit PCB.

Browse all codes in this manual (110)
Verified technical data. Last updated: April 2026

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Source: Mitsubishi Heavy Industries Air Conditioners
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