• 770 Answers SOURCE: you have either a Defrost heater / a defrost timer/ or a defrost bi-metal that is bad. If you post your model # i can look it up and show you how to set it into defrost to see if the heaters are ok Since you replaced the timer already that leaves two things you need to check set it into defrost if you know how and remove the panel in the back wall of the freezer you should see the heater(s) are on if not check pwr 120vac at the heaters if 0 volts the bi-metal is bad Posted on Feb 22, 2008.

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