Thermistor Characteristics (Rough value)
If Thermistor is either open or shorted, replace it and reset the power.
Detective Actuators:
Indoor unit Controller PCB
Heat exchanger (MID) Thermistor
Detective details:
Heat exchanger (MID) thermistor is open or short is detected always.
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)
If the voltage does not appear, replace Controller PCB and execute the check operation again.
DC
02-15
Trouble shooting 12
INDOOR UNIT Error Method:
Indoor Heat Ex. Thermistor Error
31.7
39.6
49.7
62.9
80.3
103.3
134.2
176.0
17.1
20.9
25.6
Resistance value (k )
Temperature
(°C )
Temperature
(°C )
0
40
45
50
14.1
55
5
10
1131.9
-30
804.5
-25
579.6
-20
422.9
-15
312.3
-10
233.2
-5
15
20
25
30
35
11.6
60
10.4
63
Resistance value (k )
BLACK
BLACK
1
2
4
CN1
BLACK
BLACK
3
1
2
4
3
Thermistor ( Pipe temp.)
Thermistor ( Room Temp.)
Indicate or Display:
Indoor Unit :
Operation lamp: 4 times Flash,
Timer lamp : 2 times Flash
ERROR CODE : [E : 42]
Wired Remote Controller :
AMP Air Conditioning
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