Do-It-Yourself Story

I 1st checked for proper evap and condenser fan operation. That was ok. I then removed plastic in freezer section to check for frost or ice build up (looking for bad defrost heater or timer or defrost termination stat). All was ok. Next I removed the thermostat and checked it using an ice bath and ohm meter. Operation when closing had high resistance. Red flag! So to confirm my assumption of a bad temp control I bypassed the temperature control and watched the box temp. Box cooled as was supposed to. Diagnosis confirmed... bad temp control.