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Trouble shooting 5
INDOOR UNIT Error Method:
Indoor Heat Exchanger Temperature
Thermistor (Middle) Error
Detective Actuators:
Indoor unit Controller PCB
Heat exchanger (MID) 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
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
Check Point 3 : Check voltage of Controller PCB (DC5.0V)
Make sure circuit diagram of indoor unit and check terminal voltage at thermistor (DC5.0V)
BLACK
1
1
BLACK
2
2
CN4
BLACK
3
3
BLACK
4
4
If the voltage does not appear, replace Controller PCB and execute the check operation again.
Indicate or Display:
Refer to error code table.
Detective details:
When
Heat exchanger (MID) thermistor
short-circuit is detected at power ON.
2.Thermistor failure
-5
0
5
233.2
176.0
134.2
35
40
45
31.7
25.6
20.8
THERMISTOR
( PIPE TEMP. )
THERMISTOR
( ROOM TEMP. )
02-07
3. Controller PCB failure
10
15
20
103.3
80.3
62.9
50
55
60
17.1
14.1
11.6
open or
25
30
49.7
39.6
65
9.7
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Troubleshooting
