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OC277-45
1) Check the indoor/outdoor connecting wire.
2) Change the connection of electric wiring.
3) Check the protection device.
4) Measure the resistance of the outdoor coil ther-
mistor. If the resistance is normal, replace the
outdoor controller board.
Check
code
Diagnosis of malfunction Cause
Check points
E0 Signal transmitting/receiving
error
(Indoor controller does not
respond to remote controller
signal.)
During individual unit control
1) Bad contact of transmission
wire
2) Signal transmitting/receiving cir-
cuit is abnormal.
1) Check the transmission wire.
2) Check with another remote controller. If “E0” is
still indicated, replace the indoor controller
board.
If other check code appears. replace the origi-
nal remote controller.
P3 Signal transmission error
(Remote controller does not
respond to indoor controller
signal.)
1) Bad contact of transmission
wire
2) Signal transmitting/receiving cir-
cuit is abnormal.
3) Wrong operation due to noise
wave emitted by other appli-
ances
1) Check the transmission wire.
2) Check with another remote controller.
If “P3” is still indicated, replace the indoor
board.
If other check code appears, replace the origi-
nal remote controller.
3) Short-circuit between 1 and 2 of CN40 and
attach CN40 to the following units.
● Second unit in twin control
● Second and third units in triple control
● Sub units in group control
P4 Abnormality of drain sensor 1) Bad contact of transmission
wire
2) Damaged thermistor
1) Check the connector.
2) Measure the resistance of the thermistor 1 - 3.
32°F ···6kΩ 59°F···3.2kΩ 86°F ···1.8kΩ
41°F ···4.8kΩ 68°F ···2.6kΩ 95°F ···1.5kΩ
50°F ···3.9kΩ 77°F ···2.2kΩ 104°F 1.3kΩ
If the resistance is normal, replace the indoor
controller board.
P5 Malfunction of drain pump 1) Malfunction of drain pump
2) Damaged drain sensor
1) Check the drain pump.
2) Check the drain sensor.
(Check the drop of water is on.)
If the resistance is normal, replace the indoor
controller board.
P6 Freezing protection/
overheating protection
is working.
1) Short cycle of air cycle
2) Dirty air filter
3) Damaged fan
4) Abnormal refrigerant
1) Clear obstructions from the air cycle.
2) Clean the air filter
3) Check the fan.
4) Check the refrigerant temperature.
P7 System error 1) Wrong address-setting
2) Signal transmitting/receiving cir-
cuit of remote controller is
abnormal.
3) Wrong SW6-setting
1) Check the address-setting.
2) Check with another remote controller. If check
code other than “P7” appears, replace the origi-
nal remote controller.
3) Check SW6 setting.
P8 Abnormality in outdoor unit 1) Wrong wiring of indoor/outdoor
connecting wire
2) Reversed phase
3) Protection device is working
4) Damaged outdoor coil thermis-
tor
P1
P2
Abnormality of room temper-
ature thermistor (RT1)
Abnormality of indoor coil
thermistor (RT2)
1) Bad contact of thermistor
2) Damaged thermistor
1) Check the thermistor.
2) Measure the resistance of the thermistor.
Normal resistance should be as follows.
32°F····15kΩ 86°F·····4.3kΩ
50°F······9.6kΩ 104°F···3.0kΩ
68°F······6.3kΩ
If the resistance is normal, replace the indoor
controller board.
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