Detective Actuators:
Indoor Unit Controller PCB Circuit
Indoor Temperature Thermistor
Detective details:
Indoor unit thermistor is open or short is detected always.
Forecast of Cause :
1. Connector failure connection 2. Thermistor failure 3. Controller PCB failuer
Check Point 2 : Remove connector and check Thermistor resistance value
Thermistor Characteristics (Rough value)
If Thermistor is either open or shorted, replace it and reset the power.
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.
6.5
8.0
10.0
12.5
15.8
20.2
25.9
33.6
3.59
4.35
5.3
Resistance value (k )
OK
OK
Check Point 3 : Check voltage of Controller PCB (DC5.0V)
Make sure circuit diagram of each indoor unit and check terminal voltage at Thermistor (DC5.0V)
If the voltage does not appear, replace Controller PCB and execute the check operation again.
DC
02-08
Trouble shooting 5
INDOOR UNIT Error Method:
Indicate or Display:
Indoor Room Thermistor Error
Refer to error code table.
Temperature (°C )
Temperature (°C )
0
40
45
50
5
10
15
20
25
30
35
Resistance value (k )
H/E Thermistor
Room Temp. Thermistor
BLACK
BLACK
1
2
1
2
1 1
2 2
CN5
CN8
GRAY
GRAY
1
2
CN7
ARTG30 / 36LHTA
BLACK
BLACK
1
2
CN114
H/E Thermistor
Room Temp. Thermistor
BLACK
BLACK
1
2
CN110
ARTG45 / 54LHTA
