Thermistor Characteristics (Rough value)
If Thermistor is either open or shorted, replace it and reset the power.
Trouble shooting 11
INDOOR UNIT Error Method:
Indoor Heat Ex. Thermistor Error
Indicate or Display:
Indoor Unit : Operation LED 4 times Flash, Timer LED 2 Times Flash,
Economy LED Continuous Flash.
Outdoor Unit : E.5 U.1
Error Code : 4 2
Detective Actuators:
Indoor Unit Controller PCB
Heat Exchanger (MID) Thermistor
Detective details:
Indoor unit thermistor is open or short is detected always.
Resistance Value ( )
Temperature (°C)
32.4
35
40.0
30
49.862.579.1100.9129.8168.6
2520151050
Resistance Value ( )
Temperature (°C)
17.821.226.3
504540
Forecast of Cause :
1. Connector failure connection 2. Thermistor failure 3. Controller PCB failuer
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
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)
Compact Wall mount circuit diagram(Connector connection)
If the voltage does not appear, replace Controller PCB and execute the check operation again.
H/E (MID) Thermistor
Room Temp. Thermistor
Room Temp. Thermistor
H/E Thermistor
DC
Cassette circuit diagram (Connector connection)
Wall mount, Floor Scircuit diagram (Direct soldering to PCB)
Duct, Floor/Ceiling circuit diagram (Connector connection)
BLACK
BLACK
3
4
CN4
1
2
3
4
1
2
BLACK
BLACK
BLACK
BLACK
BLACK
BLACK
1
2
1
2
CN3
CN1
1
2
3
1
2
3
RED
WHITE
H/E Thermistor
Room Temp. Thermistor
BLACK
BLACK
1
2
1
2
1 1
2 2
CN5
CN8
GRAY
GRAY
1
2
CN7
BLACK
BLACK
1
2
1
2
1 1
2 2
CN5
CN8
GRAY
GRAY
H/E (MID) Thermistor
Room Temp. Thermistor
02-27
To Next Page
Loading...
Need help?
General
