Mitsubishi Electric · MSZ-AY Air Conditioners
The upper lamp on the indoor unit blinks 2 times. This indicates a problem with either the room temperature thermistor or the indoor coil thermistor, which measure temperatures for proper operation.
Click steps to track your progress.
Check for any conditions that might cause false temperature readings, such as blocked airflow to the thermistors.
Try resetting the unit by turning off the main power supply for a few minutes, then turning it back on.
Contact a service technician to check the room temperature and indoor coil thermistors.
Do not restart the unit without proper repair to prevent potential hazards.