Question about Whirlpool Refrigerators
Most defrost circuits are turned off by a either a timer or defrost terminator (a thermal cut out switch that is mounted to the evaporator coil in the freezer compartment). The circuit is designed so that once the temperature of the evaporator coil reaches about 50 degrees F, the heater is shut off by the thermal cut out switch. If it fails to reach that temperature in about 30 minutes time, the timer will shut off the defrost heater.
Since neither shut off device is working as expected, I suspect that one failed some time ago, unbeknown to you. This left the remaining device to stop the defrost cycle since that time. Now, this second device is is having issues, and you're just now seeing the result.
This is a repair that can be done be by the homeowner - BUT - may require working on live circuits for testing and potential of freezing skin due to accidental contact with refrigerant gas. As such, a pro should be called if not completely confident of performing the work.
Posted on Oct 01, 2010
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Posted on Jan 02, 2017
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