Question about Refrigerators
The problem is the "Mother Board" and although many here argue with me about this I talk from experience.
Posted on Mar 17, 2011
This is a frost free refrigerator. The fact that you have frost build up is a sign that the defrost circuit has failed, causing the vents to become blocked and not allowing the refrigerator to cool properly. It can be fixed if you have some mechanical abilities.
The water source that is causing ice build up on your coils comes from the air. The coils are below freezing and the water in the air are freezing on to the coils. Your problem is that your defrost circuit in your fridge has failed. It is made up of three parts, the defrost timer, defrost heater, and thermostat.
The way it works is that normally the compressor has power for 8 hours, then the timer 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 switches the power back to the compressor again to restart the 8 hour cooling cycle.
Any of the three components can fail causing you not to get the defrost cycle to work. Typically the timer stops advancing so you either stay in permanent cooling or defrost mode. Or the heater burns out so it can't heat up the coil.
To start, check the defrost timer. It looks like this:
It's located in the temperature control box in the refrigerator compartment. On the side of the timer, there is a round cam that can be turned with a straight screwdriver. Turn it until it clicks. With the fridge plugged in, the compressor should stop and the heater should be turning on and getting warm. Look and listen for signs of melting ice on the coils. There should sounds of ice crackling and water dripping out the drain tube below the fridge. If there is no ice melting, the problem is with the heater/thermostat.
Unplug the fridge and remove the back panel in the freezer compartment. The heater is usually mounted on the bottom of the coil. If you have a meter you can check the heater for continuity. If it open, it needs to be replaced. You can get replacement parts at your local appliance repair supply or online such as repairclinic.com.
To help you locate the parts in your fridge and replacement parts, this link will give you diagrams for your refrigerator. http://www.appliancepartspros.com/partsearch/model.aspx?model_id=44882&diagram_id=28491069#d28491069
Hope this helps you, let me know if you need any additional help.
Posted on Mar 17, 2011
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Posted on Jan 02, 2017
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