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Trouble shooting 19
OUTDOOR UNIT Error Method:
Compressor temp. sensor error
Detective Actuators:
Outdoor unit Main PCB
Compressor temperature thermistor
Forecast of Cause :
1. Connector connection failure
Check Point 1 : Check connection of connector
Check if connector is removed.
Check if connector is erroneous connection.
Check if thermistor cable is open.
>> Upon correcting the removed connector or mis-wiring, reset the power.
OK
OK
Check Point 2 : Remove connector and check thermistor resistance value
Thermistor characteristics (Approx. value)
Temperature(°C)
Resistance Value (k )
Temperature(°C)
Resistance Value (k )
If Thermistor is either open or shorted, replace it and reset the power.
OK
OK
Check Point 3 : Check voltage of Main PCB (DC5.0V)
Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC5.0V)
BLACK
CN22
BLACK
BLACK
CN23
BLACK
BROWN
CN24
BROWN
BLACK
CN25
BLACK
BLUE
CN26
BLUE
BROWN
CN27
BROWN
If the voltage does not appear, replace Main PCB.
Indicate or Display:
Detective details:
When Compressor temperature thermistor open or short-circuit
is detected at power ON or while running the compressor.
2. Thermistor failure
-30
-20
-10
1013.1 531.6 292.9 168.6
60
70
80
12.3
8.7
6.3
THERMISTOR
( HEAT EXCHANGER MID. )
THERMISTOR
( HEATSINK PFC )
THERMISTOR
( DISCHARGE PIPE )
THERMISTOR
( HEAT EXCHANGER OUT )
THERMISTOR
( OUTDOOR TEMP. )
THERMISTOR
( COMPRESSOR TEMP. )
02-21
3. Main PCB failure
0
10
20
30
100.9
62.5
40.0
90
100
110
120
4.6
3.4
2.6
2.0
40
50
26.3
17.8
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Troubleshooting
