14
Check
code
Diagnosis of malfunction
Cause
Check points
(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
4
~
5
.
As for the normal resistance, refer to the case
of P1.
If the resistance is normal, replace the indoor con-
troller 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 drain sensor heater. Normal resis-
tance should be 82
Ω
.
If the resistance is normal, replace the indoor con-
troller board.
(P6)
Coil frost protection is work-
ing.
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.
(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
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.
(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.
0°C ···15k
Ω
30°C ····4.3k
Ω
10°C ·····9.6k
Ω
40°C·····3.0k
Ω
20°C ·····6.3k
Ω
If the resistance is normal, replace the indoor
controller board.
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