Mitsubishi Electric · MSZ-FH Air Conditioners
When the unit is in failure mode recall function, the indoor unit's POWER lamp blinks at 0.5-second intervals, accompanied by a beep. This indicates a general abnormal condition in either the indoor or outdoor unit.
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Observe if the POWER lamp stays ON for 3 seconds before blinking; if so, the outdoor unit is abnormal and requires checking the outdoor unit service manual.
If the lamp blinks immediately, the indoor unit is abnormal; refer to specific indoor unit blink patterns (found on page 22 of the manual).
Ensure to check at least two consecutive blinking cycles for accurate diagnosis.
Release the failure mode recall function by turning OFF the power supply and then turning it ON again.
Alternatively, press the RESET button on the remote controller to release the function.