Mitsubishi PUHZ-SHW80YAA Service Manual page 31

Symptoms: Nothing is displayed on the remote controller. 3
Check the voltage of the
terminal block (TB6) of
the remote controller.
10 to 16 V DC?
NO
Check the status
of the LED2.
Blinking
Check the status of the LED2
after disconnecting the remote
controller wire from the indoor
unit.
Check the status
of the LED2.
Blinking
OCH651
Diagnosis flow
YES
Lighting
Lighting
controller board
LED1 :
LED2 :
LED3 : —
Cause
troubleshooting
remote controller remote controller.
contact of the remote
controller wire remote controller wire.
Check the voltage of the
remote controller wire.
If it is not between 10 and
16 V DC, the indoor
controller board must be
defective.
wire short-circuits controller wire is
short-circuited.
controller board controller board.
or