©2009McQuay
25
Item Error Code Description Reasons Solutions
1. motor is damaged(cooling) Change motor;
2. air is short circuit (cooling) improve condenser air circulation;
3. heat exchanger is dirty (cooling) clean condenser
4. refrigerant side filter is dirty check and replace
5. ambient temperature is too high (cooling) power off
6. too much refrigerant charge discharge some refrigerant
7. PCB high pressure output failure change PCB
5
ER20
(LED)
high pressure
malfunction
8. voltage switch failure change pressure switch
1. leakage or lack of refrigerant check leakage and charge
2. PCB low pressure output failure. change PCB
3. low pressure sensor failure change pressure sensor switch
2. EWT/LWT too low under cooling mode
3. discharge temperature too high for 3 times
4. fan overload for 3 times
5. high pressure malfunction for 3 times
6
ER21
(LED)
low pressure
malfunction
6. water differential gauge witched off
1. EWT setting too low re-set EWT
2. lack of water flow; water temperature difference too high check hydraulic system
7
ER25
(LED)
EWT/LWT too
low
2. electric heater short circuit change electric heater
1. temperature sensor is broken change
8
ER27
(LED)
ambient
temperature
too high/low
2. beyond the operating limit power off
1. Low pressure/temperature sensor is broken change
9
ER29
(LED)
over heat lower
than 2 for 5
minutes
2. EXV failure change EXV
10
ER32
(LED)
suction
temperature
too high (over
40℃)
discharge temperature too high so compressor self-protection
check suction/discharge pressure and power input
check if ambient condition is normal
check if there is mode transform
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