12
TROUBLESHOOTING
8
8-1. CAUTIONS ON TROUBLESHOOTING
(1) Before troubleshooting, check the followings:
1
Check the power supply voltage.
2
Check that the indoor/outdoor connecting wire is correct.
(2) Take care of 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
components.
3
When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.
Lead wire
8-2. MALFUNCTION-DIAGNOSIS METHOD BY REMOTE CONTROLLER
Errors detected by indoor unit
E9
Check code
Symptom
Remark
Wired remote controller
Check code
Wired remote controller
P1
Intake sensor error
P9
Pipe (TH5) sensor error
P2
Pipe (TH2) sensor error
E6,E7
Indoor/outdoor unit communication error
P4
Drain sensor error
P5
Drain pump error
P6
PL
Freezing/Overheating protection operation
Abnormal refrigerant circuit
EE
Communication error between indoor and outdoor units
P8
Pipe temperature error
E4, E5
Remote controller signal receiving error
–
–
–
–
Errors detected by unit other than indoor unit (outdoor unit, etc.)
*1 The check code in the parenthesis indicates PAR-30MAA model.
Symptom
Remark
Indoor/outdoor unit communication error
(Transmitting error) (Outdoor unit)
Open/short of outdoor unit thermistors
Compressor overcurrent interruption (When compressor locked)
Abnormal high discharging temperature/49C operated/
insufficient refrigerant
Abnormal high pressure (63H operated)/Overheating
protection operation
Abnormal temperature of heatsink
Outdoor unit fan protection stop
Compressor overcurrent interruption/Abnormal of power module
Abnormality of superheat due to low discharge temperature
Abnormality such as overvoltage or voltage shortage and
abnormal synchronous signal to main circuit/Current sensor error
U2
U5
UP
U3,U4
UF
U1,Ud (UD) *1
U8
U6
U7
U9,UH
Others
–
–
–
–
Other errors (Refer to the technical manual for the outdoor unit.)
For details, check
the LED display
of the outdoor
controller board.
As for outdoor
unit, refer to
outdoor unit’s
service manual.
Fb (FB) *1
Indoor unit control system error (memory error,etc.)
E0, E3
E1, E2
Remote controller control board error
Remote controller transmission error
Compressor overcurrent interruption
continued to the next page.
OCH493D
