Mitsubishi Electric · MSZ-FH Air Conditioners
When in air purifying power failure mode recall function, the POWER lamp flashes once. This indicates that the AIR PURIFYING power cannot be turned OFF even when the AIR PURIFYING operation is turned OFF with the remote controller, or a specific voltage drop at CN1T1 (+)-(GND).
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Refer to 10-6. 'Check of AIR PURIFYING power' (further details may require an installer).
Ensure the remote controller is working correctly and sending signals.
Turn OFF the power supply to the unit for a few minutes, then turn it back ON.