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80

Indoor unit fan motor abnormal — RUN LED flashes 8 times, TIMER LED OFF

Mitsubishi Heavy Industries · Air Conditioners

What does 80 mean?

The indoor unit's fan motor is detected to be running at 300 min-1 or lower speed while the air conditioner is operating and the fan motor is commanded to be ON.

Common Causes

  • Faulty indoor fan motor
  • Poor connector connections to the fan motor
  • Obstruction preventing fan rotation
  • Faulty indoor PCB

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the main power to the unit.

  2. 2

    Inspect the indoor fan motor and fan blades for any obstructions (debris, dirt buildup) that might be preventing it from rotating freely and remove them.

  3. 3

    Check the electrical connections to the indoor fan motor for any looseness or damage.

  4. 4

    Manually check if the fan blade spins freely without power.

  5. 5

    If the fan motor is unobstructed and connections are sound, the indoor fan motor or indoor PCB may be faulty and require professional service.

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
Open Manual (Page 53)Search more codes in this manual