Some small motors us a current relay (you'll proberbly find one on your fridge), no centrifugal switch, I think if these give up, you just replace them, but I imagine it would be worth looking to see if the contacts are OK.
As the others have said, the centrifugal switch is the first thing to look at.
I think the idea of the relay on the frig is that being a sealed unit, the less bits and pieces inside the unit the better. Ian S C
Edited By Diane Carney on 14/02/2013 13:54:20