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Les langues disponibles
Les langues disponibles
Fault code
Panel description
Detail description
AL139
AL139 Low temp. alarm
Too low outlet water temperature protection
AL153
AL153 Fan1 fault
Speed control fan 1 failure
AL154
AL154 Fan2 fault
Speed control fan 2 failure
AL155
AL155 Fans Offline
Speed control fan
Annex "B"
Possible cause
Diagnostics method
3. The water pump has air pockets (either in
The outlet water temperature is below 5 degrees
the impeller or in the piping around it
Celcius
4. There is air in the pipeline, which leads to
The outlet water temperature is below 5 degrees
poor water flow
Ceclius
1. The fan driver dial switch is abnormal
Visual inspection
2. The fan inverter board is broken
Visually check that the power light is not on
3. The fan motor is broken
Manual rotation of fan motor, still stuck
Page 3 of 3
Heat Pump Troubleshooting Schedule
What to do?
Purge water pump
Install an automatic air vent at the highest point of the piping system
Fan dial switch top-left-below-right
Replace the fan inverter board
Replace the fan motor
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