You would need to find out what accomplishes the defrosting. Common reasons for defrost failure include:
1. A heating element for that purpose has burned out.
2. A mechanical timer used to switch the heating element on and off (say once for one hour every 12 hours) has stopped running.
A schematic diagram, either in the manual or on the inside of a panel of the unit, would show the defrost mechanism and/or components.
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Last edited by AllanJ; 06-10-2012 at 03:48 PM.
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