Westinghouse RJ340M - not cooling?

Hi,

Machine has power, but will stop cooling in both fridge and freezer compartments.

When disconnecting from AC mains for couple days, it starts up ok and reaches optimum cooling again.

When taking off the back lower panel, there is a rod which can be turned (looks like a relay of some sort).

A few months ago, had this same problem so I turned this lever clockwise, then it make a 'click' and the compressor kicked in.

Any ideas?

Scott