Question about Microwave Ovens
You have a problem with the defrost circuit of your refrigerator. The frost is building up on the evaporator coils in the freezer preventing air circulation from the refrigerator to be cooled off by the coils. It is made up of three parts, the defrost timer/control module, defrost heater, and thermostat.
The way it works is that normally the compressor has power for 8- 24 hours, then the timer/module cuts power off and sends power to the defrost heater for about 45 minutes. The heater is attached to the coil and warms up the coil to melt the ice. When the coil reaches about 40 deg F, the thermostat which is in series with the heater, opens up cutting off power to the heater. This prevents the freezer from getting too hot. After the 45 minutes are up, the timer/module switches the power back to the compressor again to restart the cooling cycle.
I don't know what make and model fridge you have since you did not supply it. But if you have an older model it is controlled by a timer, often it fails to advance to the defrost mode causing it to stay in cool mode. Often the problem is that the defrost heater burns out so it can't melt the frost on the coils.
If you take the panel off the back of the freezer you will find the evap coil. You can use a hair dryer to melt the ice. The heater will be attached to the coil. If you have a meter you can check whether it is burned out. Replacement parts can be found at your local appliance repair outlet or online at repairclinic.com.
Posted on Mar 24, 2011
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Posted on Jan 02, 2017
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