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Trouble shooting 13
INDOOR UNIT Error Method:
Indoor Room Thermistor Error
Detective Actuators:
Indoor unit Controller PCB Circuit
Indoor Temperature Thermistor
Forecast of Cause :
1. Connector failure connection
Check Point 1 : Check connection of Connector
Check if connector is loose or removed
Check erroneous connection
Check if thermistor cable is open
>>Reset Power when reinstalling due to removed connector or incorrect wiring.
OK
Check Point 2 : Remove connector and check Thermistor resistance value
Thermistor Characteristics(Rough 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
Check Point 3 : Check Voltage of Controller PCB (DC 5.0V)
Make sure circuit diagram of each indoor unit and check terminal voltage at Thermistor (DC5.0V)
BLACK
1
1
CN8
BLACK
2
2
BLACK
1
1
CN32
2
2
BLACK
3
3
If the voltage does not appear, replace Controller PCB and execute the check operation again.
Indicate or Display:
Error code : 41
Detective details:
Indoor unit thermistor is open or short is detected always.
2. Thermistor failure
-10
-5
0
58.2
44.0
33.6
30
35
40
8.0
6.5
5.3
Room Temp. Thermistor
H/E Thermistor
3. Controller PCB failure
5
10
15
20
25.9
20.2
15.8
12.5
45
4.3
02-14
Outdoor unit : No indication
25
10.0
DC
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