Product review (5 stars): Up and running in 15 minutes
Replaced my 15 y/o timer and got my refrigerator up and running again.  In my case my defrost heater was constantly on, pretty easy to tell as half of my freezer coil was frozen and half not.  Felt wire and it was constantly warm.  Had to drill a few holes in the existing thermostat housing but it was up and running in 15 minutes.