9-1. CAUTIONS ON TROUBLESHOOTING
(1) Before troubleshooting, check the followings:
1 Check the power supply voltage.
2 Check the indoor/outdoor connecting wire for mis-wiring.
(2) Take care the followings during servicing.
1 Before servicing the air conditioner, be sure to turn off the remote controller first to stop the main unit, and then turn
off the breaker.
2 When removing the indoor controller board, hold the edge of the board with care NOT to apply stress on the
3 When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
9-2. SELF-CHECK FUNCTION
Wired remote controller
(1) Turn on the power.
(2) Press the [CHECK] button twice.
(3) Set refrigerant address with [TEMP] button
if system control is used.
(4) Press the [ON/OFF] button to stop the
A A CHECK button
B B Refrigerant address
C C TEMP button
D D IC : Indoor unit
OC : Outdoor unit
E E Check code
• For description of each check code, refer to the following table.
Intake sensor error
Pipe (TH2) sensor error
Pipe (TH5) sensor error
Indoor/outdoor unit communication error
Drain sensor error
Drain pump error
Freezing/Overheating protection operation
Communication error between indoor and outdoor units
Pipe temperature error
Remote controller transmission error
Remote controller control board error
Indoor unit control system error (memory error, etc.)
Indoor/outdoor unit communication error (Transmitting error) (Outdoor unit)
Compressor overcurrent interruption
Open/short of outdoor unit thermistors
Compressor overcurrent interruption (When compressor locked)
Abnormal high discharging temperature/49C worked/insufficient refrigerant
Abnormal high pressure (63H worked)/Overheating protection operation
Abnormal temperature of heat sink
Outdoor unit fan safeguard stop
Compressor overcurrent interruption/Abnormal of power module
Abnormality of super heat due to low discharge temperature
Abnormality such as overvoltage or voltage shortage and abnormal synchronous signal to main circuit
/Current sensor error
Other errors (Refer to the technical manual for the outdoor unit.)
• On wired remote controller.
1 Check code displayed in the LCD.
For details, check the LED display
of the outdoor controller board.
As for outdoor unit, refer to
service manual OC322.