Trouble shooting 21
OUTDOOR UNIT Error Method:
Detective Actuators:
Detective details:
Forecast of Cause :
OK
OK
OK
OK
Compressor Thermistor Error
Outdoor unit Main PCB
Compressor temperature thermistor
When Compressor temperature thermistor open or short-circuit
is detected at power ON or while running the compressor.
1. Connector connection failure 2. Thermistor failure 3. Main PCB 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.
Check Point 2 : Remove connector and check thermistor resistance value
Thermistor characteristics (Approx. value)
If Thermistor is either open or shorted, replace it and reset the power.
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)
If the voltage does not appear, replace Main PCB.
02-24
17.8
26.3
20
40.0
62.6
79.1
100.9
129.8
168.6
Resistance value (k )
0
1
5
1
1013.1
-30
531.6
-20
292.9
-10
221.1
-5
5
0
Temperature
(°C )
12.3
30
0
4
0
5
60
2.0
3.4
4.6
6.3
8.7
Resistance value (k )
120
100
0
7
0
8
0
9
Temperature
(°C )
BROWN
BROWN
BLUE
BLUE
Thermistor
(Discharge pipe)
Thermistor
(Heat exchanger)
Thermistor
(Outdoor temp.)
Thermistor
(Compressor temp.)
3
2
1
3
2
1
3
2
1
3
2
1
CN62
BLACK
BLACK
3
2
1
3
2
1
CN65
BROWN
BROWN
3
2
1
3
2
1
CN63
CN64
Indicate or Display:
Indoor Unit :
Operation lamp: 7 times Flash,
Timer lamp : 2 times Flash
ERROR CODE : [E : 72]
Wired Remote Controller :
AMP Air Conditioning
www.ampair.co.uk | [email protected]
