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Troubleshooting
Topside Indicators
Malfunction
Malfunction Description
Code
ER19
Heat pump
ER18
Exhaust gas temp. Error
ER20
Abnormal protection of frequency conversion module
ER21
Ambient temp. Error
ER23
Heat pump
ER27
Outlet temperature fault
ER29
Return gas temp. Error
ER32
Heating outlet water high temperature protection
ER33
Outer door coil high temperature protection
ER35
Compressor current protection
ER42
Internal coil temperature failure
ER44
Ambient temperature too low protection
ER46
DC fan error
21
Solution
DC Fan Motor Failure
Cause
The sensor plug is in poor contact or off, or the sensor is damaged
Action
Check and replace the exhaust gas temperature sensor (T1)
Cause
IPM module internal fault, check related problems according to the attached table
Cause
The sensor plug is in poor contact or off, or the sensor is damaged
Action:
Check and replace the ambient temperature sensor (T4)
Cooling outlet water temperature low protection
Cause
The sensor plug is in poor contact or off, or the sensor is damaged
Action
Check and replace the water outlet temperature sensor (T6)
Cause
The sensor plug is in poor contact or off, or the sensor is damaged
Action
Check and replace the suction gas sensor (T5)
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Cause
1. Dc fan failure
2. Plug is in poor contact or off
Action
1. Replace the DC fan
2. Reconnect cables to the DC fan
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