Not quite the same unit, but simialr problem.

The actual compressor is run by a electrical (onic) box.

Its connected by a several wires, 12v supply, the thermostat switch, and power to the compressor.

Long way round to saying that the electrical box was U/S, and easily if not expensively replaced (160 squids)

Your unit might not be the same tho......

Weaco were fairly helpful when rung up.

Phone number is on the web somewhere.

Good luck

MJ