31
Check
code
Diagnosis of malfunction
Cause
Check points
4
Abnormality of drain sensor
1) Bad contact of transmission
wire
2) Damaged thermistor
1) Check the connector.
2) Measure the resistance of the thermistor
(between
➃
-
➄
of CN50).
As for the normal resistance, refer to the case
of P1.
If the resistance is normal, replace the indoor con-
troller board.
5
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
. (between
1
-
3
of
CN50).
If the resistance is normal, replace the indoor con-
troller board.
6
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.
8
Abnormality in outdoor unit
❈
The number of check code shows times of Buzzer sound.
1) Wrong wiring of indoor/outdoor
connecting wire
2) Reversed phase
3) Protection device is working
1) Check the indoor/outdoor connecting wire.
2) Change the connection of electric wiring.
3) Check the protection device.
1
2
Abnormality of room temper-
ature thermistor (RT1)
Abnormality of pipe tempera-
ture 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
:
···15k
Ω
30
:
·····4.3k
Ω
10
:
······9.6k
Ω
40
:
·····3.0k
Ω
20
:
······6.3k
Ω
If the resistance is normal, replace the indoor
controller board.
Cause
1) Indoor/outdoor connecting wires are poorly connected.
(Refer to the below.)
2) Power supply is poorly connected.
3) Connector is broken.
4) Fuse (5A) in the outdoor controller board is blown.
Check points
1) Check the connecting wires.
2) Check the power supply.
3) Check connector.
4) Check the fuse.
3.WHEN OUTDOOR UNIT DOES NOT WORK
4. WRONG WIRING ON SITE
Symptom due to wrong wiring between indoor and outdoor units
Wrong wiring
Thermostat
Phenomena
OFF
Operation stops.
ON
9 minutes later, the check code ¨P8¨ appears on the remote con-
troller display.
Disconnect between 1 and 1 or 2 and
2.
OC232--2.qxp 01.10.1 8:58 PM Page 31
