©2009McQuay
26
Item Error Code Description Reasons Solutions
1. motor failure(cooling)
2. return air short circuit (cooling)
3. condenser is dirty (cooling)
Change fan motor;
Improve terminal equipment air circulation;
Clean condenser
4. EWT is too high re-set EWT by service personal
11
ER33
(LED)
discharge
temperature
too high
5. lack of refrigerant or leakage charge refrigerant
1. Comp.1 discharge temperature sensor disconnect check TH1 resistance/ change
12
ER40
(LED)
TH1 failure
2. PCB failure change PCB
1. Comp 2 discharge temperature sensor disconnect check TH2 resistance/ change
13
ER41
(LED)
TH2 failure
2. PCB failure change PCB
1. mid- coil temperature sensor disconnect check TH3 resistance/ change
14
ER42
(LED)
TH3 failure
2. PCB failure change PCB
1. condenser inlet temperature sensor disconnect check TH4 resistance/ change
2. condenser inlet temperature beyond 120℃
Refer to item 11
15
ER43
(LED)
TH4 failure
3. PCB failure change PCB
1. EWT sensor disconnect/short circuit check TH6 resistance/ change
16
ER45
(LED)
TH6 failure
2. PCB failure change PCB
1. LWT sensor disconnect/short circuit check TH7 resistance/ change
17
ER46
(LED)
TH7 failure
2. PCB failure change PCB
1. ambient temperature sensor disconnect/short circuit check TH8 resistance/ change
18
ER47
(LED)
TH8 failure
2. PCB failure change PCB
1. condenser outlet temperature disconnect/short circuit check TH10 resistance/ change
19
ER49
(LED)
TH10 failure
2. PCB failure change PCB
1. suction temperature sensor disconnect/short circuit check TH12 resistance/ change
20
ER51
(LED)
TH12 failure
2. PCB failure change PCB
1. low pressure sensor phase wrong re-do the wiring
2. low pressure sensor is broken/disconnect/short circuit change low pressure sensor cable
21
ER53
(LED)
low pressure
sensor failure
3. PCB failure change PCB
Note: For trouble elimination, we recommend service personnel to bring a 10K resistance (25℃)。 If there is sensor failure, connect the resistance
with PCB temperature port to find out the solution.
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