Mitsubishi Electric · MSZ-FH Air Conditioners
The POWER lamp lights up solid, and the outdoor unit does not operate. This indicates a problem reading data from the nonvolatile memory of the inverter P.C. board or the outdoor electronic control P.C. board.
Click steps to track your progress.
Turn OFF the main power supply to the air conditioner, wait 30 seconds, then turn it back ON.
Attempt to restart the unit using the remote controller.
Ensure the outdoor unit is free of debris and has proper ventilation.
If the error persists, contact a qualified service technician. They may need to check the blinking pattern of LEDs on the outdoor control boards.
Refer to the outdoor unit service manual for further troubleshooting.