The defrost timer may need a bit of adjustment. The defrost timer should
have either a thumb wheel or a slot for a screwdriver on the front of it,
and turning it slowly anti-clockwise until the compressor starts, maybe all
that is needed. You can identify the timer by the shape of it. Most are a
rectangular shape with one corner cut off ( a bit like this :
) and they will have at least
four connected wires along one edge.
If you give the cam a turn and the compressor starts, then in a day or two
it fails again, this means that the little motor in the timer has failed or
is failing and the unit will need replaced.
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