Mitsubishi Electric · MSZ-AY Air Conditioners
In AIR PURIFYING power failure mode recall function, if the indoor POWER lamp blinks four times, it indicates an issue where the voltage between CN1T1 (+) and (GND) on the electronic P.C. board falls significantly (0.4V / 0.5ms).
Click steps to track your progress.
Release the failure mode recall function by cycling power to the unit or pressing the remote controller's RESET button.
Ensure the front panel is securely closed.
If the problem persists, contact a service technician to check the AIR PURIFYING power voltage.