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Trouble shooting 11
INDOOR UNIT Error Method:
Indoor unit Heat Ex. middle temp.
sensor error
Detective Actuators:
Indoor unit Controller PCB
Heat exchanger temperature thermistor (Middle)
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 (
Temperature (°C)
Resistance Value (
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)
AB*G18LVTB, 22/ 24LVTA
BLACK
GRAY
1
1
1
1
CN5
BLACK
GRAY
2
2
2
2
H/E (MID) Thermistor
1
CN7
2
Room Temp. Thermistor
BLACK
1 1
CN8
BLACK
2 2
ARTG45/ 54LHTB, 60LHTA
H/E (MID) Thermistor
BLACK
1
1
CN110
BLACK
2
2
Room Temp. Thermistor
BLACK
1 1
CN114
BLACK
2 2
If the voltage does not appear, replace Controller PCB.
Indicate or Display:
Refer to error code table.
Detective details:
When Heat exchanger temperature thermistor (Middle) open or
short-circuit is detected at power ON.
2.Thermistor failure
-30
-20
-10
)
1131.9
579.6
312.3
25
30
49.7
39.6
31.7
)
AU*G36/ 45/ 54LRLA
1
CN5
2
1
CN7
2
1 1
CN8
2 2
Other model
1
CN5
2
1
CN7
2
1 1
CN8
2 2
3. Controller PCB failure
-5
0
233.2
176.0
134.2
35
40
45
25.6
20.8
BLACK
1
BLACK
2
H/E (MID) Thermistor
Room Temp. Thermistor
RED
RED
GRAY
1
GRAY
2
H/E (MID) Thermistor
Room Temp. Thermistor
BLACK
BLACK
02-13
5
10
15
103.3
80.3
62.9
50
55
60
17.1
14.1
11.6
10.4
AR*G45/ 54LHTA
H/E (MID) Thermistor
GRAY
1
1
CN7
GRAY
2
2
Room Temp. Thermistor
BLACK
1 1
CN8
BLACK
2 2
20
63
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Troubleshooting
