Question about Refrigerators
Evaporator coil behind the cover on the back wall inside the freezer will ice up under normal conditions. Every 8 to 10 hours for around 20 minutes the defrost timer (or in most newer models the electronic adaptive defrost control) will turn the defrost heater on to melt the built up ice. There is a defrost thermostat which prevents the heater from overheating the freezer by breaking the heater circuit when the temp reaches close to 32 degrees F. The entire cooling system shuts off during the defrost cycle and starts back when the timer advances through the cycle.
If this ice is not melted it will continue to build up until the air can’t flow over the coil to circulate the cold air through the freezer and into the fridge. The temperature change in the fridge is usually noticed first followed by the freezer.
If the defrost thermostat is bad, it can prevent the heater from coming on OR it won’t turn the heater off when it gets too warm. It is clamped to the evaporator coil at the top to sense the temp. If it appears to be misshapen it is bad.
With an ohm meter it should show continuity when cold and none when warm.
You can also bypass(disconnect the two wires plugged into it and twist them together) the thermostat to see if the heater comes on then. If it does then you know the thermostat is bad and needs replaced.
The defrost heater is located on the evaporator. It is in a tube which is at the bottom and can also go up the sides of the evaporator. On some types you can see a burnt spot if it’s bad. With an ohm meter it should show continuity from end to end when disconnected from the wiring in the freezer. You can also test the wiring for voltage when it’s in the defrost mode.
If you have a defrost timer you can test it. It can be located under the fridge behind the kick panel on the front. Some are in the fridge with the controls at the top. You can turn the defrost timer till it clicks and everything shuts down. The heater should now come on. If it does, replace the timer because that means the timer is not running. If it doesn't, check the heater and defrost thermostat. Turn the timer again till everything starts back up to end the defrost cycle.
If you have an adaptive defrost control instead of a timer, replace it if the heater and thermostat test good. It is located in the fridge with the controls in some models and on the back in others.
You can post your model number into one of several appliance parts sites on the internet and search for defrost components to find your parts.
Posted on Aug 24, 2010
Freezer can be fairly complicated pieces of machinery, appliance within your kitchen. So if you have a significant problem with it, most likely you're going to have to contact a qualified service center to come in and check out and repair your freezer. But there are some things that you can do yourself, just to check on, if it's, happens, not happens to be working right. Now one of the problems we have is if we have our temperature, if it's not getting as cold as it should be, in either the freezer or the refrigerator compartment, then what we want to do as a homeowner, is we want to check down here at the base. And down here at the base there's a grill that runs all long the length of the freezer and air is actually drawn in through this grill and goes over the condenser coils that cools the refrigerant that actually runs your, your freezer. Now over a period of time, a lot of dust and lint and everything can, can build up in there, so one thing you want to do is you want to take a vacuum cleaner and you want to keep this cleaned out periodically. So if you're having some problems with your freezer, it could be that that has gotten so clogged up with dirt and lint, that you're not getting enough air flow to cool the refrigerant and get the cooling that you need. So that's one thing that you can do to check out your freezer and see if it's working properly. Now if you have some problems beyond that, again, as you said you can hear the fan running, then you might need get a repairer to help check and fix the problem. you can try the above suggested solution to solve the problem.
Posted on Aug 24, 2010
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Posted on Jan 02, 2017
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