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6
FAULT FINDING
The following faults and probable cause/s have been listed with the assumption that
all basic checks have been carried out. Example, product has power, 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 specifications).
•
Check Run Capacitor.
(Manual Compressor Starting Device can be used to confirm diagnostics.)
6.2
Compressor Starts, Runs And Then Stops
•
Check connections at the fusite plug, overload and control module connections.
•
Check supply voltage.
(Manual Compressor Starting Device can be used to confirm diagnostics.)
6.3
Compressor Humming
•
Check continuity of overload. If no continuity replace overload.
•
Check connections at the fusite plug, overload and control module connections.
•
Check Start and Run Winding (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 cooling plate for frost pattern. Full frost pattern is required. If not a full
frost pattern, check product for shortage of refrigerant or inefficient compressor.
•
Check temperatures of cooling plate both intake and exit of plate. If temperature
of intake differs from exit temperature, further investigation is required.
6.5
PC Warm
•
Check setting of control knob.
•
Check resistance of variable resistor.
•
Check resistance of PC sensor as per table.
•
Check if cooling plate has normal frost pattern. If not, further investigation is
required.
6.6
FC Too Cold
•
Check setting of control.
•
Check if PC sensor is in correct position.
•
Check resistance of PC sensor as per table.
•
Check if FC Evaporator has normal frost pattern. Checking temperature of the FC
evaporator and cooling plate is recommended to rule out or confirm system or
compressor fault/s.
