Delfield replacement cold control thermostats. A bad thermostat can wreak havoc to a refrigeration system. Determine what is causing the temperature problem. Check that the Door gasket has a good seal. Refer to your Delfield manual on how to remove the thermostat cover and test with a continuity tester, you might have an open circuit. Extend product life, save energy by replacing a bad thermostat. Have a question email us orders