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6
FAULT FINDING
The following faults and probable causes have been listed with the assumption that all basic
checks have been carried out, such as the product has power, the door is closing correctly, etc.
6.1
Compressor Won’t Start.
Check continuity of overload. If no continuity, replace overload.
Check start and run winding (as per specification).
Check run capacitor.
(Manual starting devices can be used to confirm diagnostics.)
6.2 Compressor Starts, Runs And Then Stops.
Check the connections at the fusite plug, overload and control module connections.
Check supply voltage.
(Manual starting devices can be used to confirm diagnostics.)
6.3 Compressor Humming
Check continuity of overload. If no continuity, replace overload.
Check connections at fusite plug, overload and control module connections.
Check start and run windings (as per specifications).
Check run capacitor.
6.4
PC Too Cold
Check resistance of variable resistor.
Check resistance of PC sensor as per table.
Check evaporator for frost pattern. A full frost pattern is required. If there is not a full frost
pattern, check product for shortage of refrigerant or inefficient compressor.
Check evaporator temperatures at the entry and exit of the evaporator. If the temperature of
the exit differs by more than 5 to 10ºC of the entry temperature, further investigation is
required.
6.5 PC Too Warm
Check setting of control knob.
Check resistance of variable resistor.
Check resistance of PC sensor as per table.
Check that the fan is operational.
Check if evaporator is defrosting correctly. If not, check the defrost sensor and/or defrost
element.
If defrost is working, check temperature of the evaporator to rule out or confirm system
and/or compressor fault/s.
