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Indoor Red/Green LEDs Off or On continuously

Indoor Red and Green LEDs Off or On continuously — Indoor circuit board or CPU failure

Mitsubishi Heavy Industries · Air Conditioners

What does Indoor Red/Green LEDs Off or On continuously mean?

Both the red and green LEDs on the indoor unit are either continuously off or continuously on. This pattern points to a failure of the indoor unit's circuit board or its central processing unit (CPU).

Common Causes

  • Indoor circuit board failure
  • Indoor CPU failure

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Perform a power cycle by turning off the air conditioner's main power switch for 5 minutes, then turning it back on.

  2. 2

    Monitor the LED status after the power reset to see if the pattern clears.

  3. 3

    If the LEDs remain in this state, it indicates a hardware fault that usually requires specialist attention.

  4. 4

    Schedule a service appointment with a certified technician.

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

Related Faults

01Power source faulty — RUN LED OFF, TIMER LED flashes 1 time05Wired remote control wiring error — RUN LED OFF, TIMER LED flashes 5 times35Cooling high pressure control activated — RUN LED flashes 3 times, TIMER LED flashes 5 times
Source: Mitsubishi Heavy Industries Air Conditioners
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