Mitsubishi Electric R410A Technical Manual page 54

Troubleshooting
Operation lamp flashes:
Timer lamp flashing at 5Hz
Room temperature sensor malfunction
Judge 1: Check the room temperature sensor
Is break off.
Judge 2: Check the room temperature sensor
is abnormal.
Validate: Check whether the resistance of the
temperature sensor is correct according to Annex 1.
Replace indoor PCB.
54
No
Yes
R410A Tropical Split Type Technical Manual
Yes
Connects it well.
No
Replace temperature sensor
Duct Type