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Refrigerator not cooling

The coils in the back of the freezer are loading up with frost and not allowing the air flow needed to cool the fridge. what part is causing this and where is it found.
chris

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  • chreesa Jun 28, 2008

    actually the defrost heater unit itself was bad. I am in the process of replacing it. will then see if timer and or sensor are bad as well. this was obviously broken though and is an easy fix.



    Chreesa

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Defrost system is not working. fault can be in several areas as follows
defrost element open circuit or the thermal fuse in series with element
defrost sensor wrong value
fault with main pcb or defrost timer if not electronically driven

Posted on Jun 28, 2008

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Check ur cold control thermostat, ur thermistors, ur air flow vent from freezer to fridge.( to make sure it opens and closes without any restrictions) On thermistors check for A close circuit and amount of ohms not just an Ohm reading. As per ur model. Most should atleast show 1200 ohms. Also Check door seals for leakage.
Evaporator coils
Poor cooling is often the result of a heavy frost build-up on the evaporator coils. You can't see these coils without removing a panel on the inside of your freezer. A sure sign that there is a build-up is the presence of any frost or ice build-up on the inside walls, floor, or ceiling of the freezer. Such a frost build-up usually indicates a problem in the self-defrosting system or damaged door gaskets.
If one of the components in the self-defrosting system fails, the refrigerator continues to try to cool. Eventually, though, so much frost builds up on the evaporator coils that the circulating fan can't draw air over the coils. There may still be a small amount of cooling because the coils are icy, but with no air flow over the coils, cooling in the refrigerator compartment is quite limited.

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Hi,
You need to check the following to make sure your fridge is working properly:
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Defrost Cycle - When the refrigerator goes into defrost, the cooling mode stops and a defrost heater energizes to remove accumulated frost from the evaporator (cooling) coil, which causes the freezer temperature to rise slightly.
Proper Air Circulation - Refrigerators require a specific amount of clearance around the cabinet to allow for air circulation. If the refrigerator does not have the minimum clearance required, the refrigerator cannot cool properly.
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You need to check the following to make sure your fridge is working properly:
Vent blockage - Air flows between the freezer and refrigerator sections to provide proper cooling via air vents.
Condenser coil - When the condenser coil is dirty it causes the sealed system to overheat and therefore the refrigerator will not cool properly.
Defrost Cycle - When the refrigerator goes into defrost, the cooling mode stops and a defrost heater energizes to remove accumulated frost from the evaporator (cooling) coil, which causes the freezer temperature to rise slightly.
Proper Air Circulation - Refrigerators require a specific amount of clearance around the cabinet to allow for air circulation. If the refrigerator does not have the minimum clearance required, the refrigerator cannot cool properly.
Hope this helps.
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Your refrigerator is telling you that it is not sensing a current flow through the defrost heater circuit within a certain number of hours. Could be a bad defrost heater, or a thermostat / fuse package located in the upper right hand corner of the freezer, behind the back wall of the freezer compartment. The reason the refrig is getting warm is that the cooling coils (behind that back wall of the freezer) are blocked up with frost, preventing air flow across them and on up into the refrigerator compartment. It is a bit of a pain to get the back wall out inside the freezer, but it will have to be done. Melting the frost off the coils with a hair blower will temporarily solve your cooling problem, allowing a week or so to get the part(s) you need.

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It sounds like the defrost circuit has not been working for a while because the ice build up is not allowing the air to circulate around the coils to cool the refrigerator. The typical failures to the defrost circuit are the defrost timer motor fails to advance, or the defrost heater burns out. Hope this helps you.

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