Trouble shooting 5
INDOOR UNIT Error Method:
Indicate or Display:
Detective Actuators:
Detective details:
Forecast of Cause :
Check Point 2 : Remove connector and check thermistor resistance value
Check Point 1 : Check connection of connector
OK
OK
31.7
35
39.6
30
49.7
62.9
80.3
103.3
134.2
176.0
Resistance value (k )
25
20
15
10
5
233.2
-5
0
Temperature (
°C )
17.1
20.8
25.6
Resistance value (k )
50
14.1
55
11.6
60
9.7
65
45
40
Temperature (
°C )
Indoor Heat Exchanger Temperature
Thermistor (Middle) Error
Indoor unit Controller PCB
Heat exchanger (MID) thermistor
When
Heat exchanger (MID) thermistor
open or
short-circuit is detected at power ON.
1. Connector connection failure 2.Thermistor failure 3. Controller PCB failure
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.
Thermistor characteristics (Approx. value)
If Thermistor is either open or shorted, replace it and reset the power.
02-07
Refer to error code table.
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)
CN4
THERMISTOR
( ROOM TEMP. )
THERMISTOR
( PIPE TEMP. )
1
4
2
3
1
4
2
3
BLACK
BLACK
BLACK
BLACK
If the voltage does not appear, replace Controller PCB and execute the check operation again.
