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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.
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