No
Yes
44
OCH751
Diagnosis flow
Cause
Inspection method and
troubleshooting
• Defective
remote controller
• Replace the
remote controller.
• Breaking or poor
contact of the remote
controller wire
• 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.
• The remote controller
wire short-circuits
• Check if the remote
controller wire is
short-circuited.
• Defective indoor
controller board
• Replace the indoor
controller board.
Symptoms: Nothing is displayed on the remote controller.
3
LED display of the indoor
controller board
LED1:
LED2: or
LED3: —
Check the voltage of the
terminal block (TB6) of the
remote controller.
Check the status of the LED2 after
disconnecting the remote controller
wire from the terminal block (TB5)
of the indoor unit.
10 to 16 VDC?
Check the status
of the LED2.
Check the status
of the LED2.
Lighting
Blinking
Blinking
Lighting
