Mitsubishi Electric Mr.SLIM PUZ-ZM35VKA-ET Service Manual page 54

Symptoms: Nothing is displayed on the remote controller. 3
Diagnosis flow
Check the voltage of the
terminal block (TB6) of the
remote controller.
10 to 16 VDC?
No
Check the status
of the LED2.
Blinking
Check the status of the LED2 after
disconnecting the remote controller
wire from the terminal block (TB5)
of the indoor unit.
Check the status
of the LED2.
Blinking
OCH653C
Yes
Lighting
Lighting
Cause
• Defective
remote controller
• Breaking or poor
contact of the remote
controller wire
• The remote controller
wire short-circuits
• Defective indoor
controller board
54
LED display of the indoor
controller board
LED1:
LED2: or
LED3: —
Inspection method and
troubleshooting
• Replace the
remote controller.
• Check if there is breaking
or poor contact of the
remote controller wire.
Check the voltage of the
terminal block (TB5)
connecting the remote
controller wire.
If it is not between 10
VDC and 16 VDC, the
indoor controller board
must be defective.
• Check if the remote
controller wire is
short-circuited.
• Replace the indoor
controller board.