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The coil of cooling system has problem

The coil of the cooling system is not defrosted as usual.As aresult,tho food compartment is not cool enough.

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  • 67 Answers

It is most likely
1/ Your defrost timer or sensor has failed.
or
2/ Your defrost element has failed.

Your timer or sensor is the cheaper to replace so try that first.

Posted on May 09, 2009

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Hotpoint Future fridge freezer - freezer working well but top of the back of the fridge has a large build up of ice ??? And doesn't appear to be keeping the food cold enough


here are lots of things that can cause cooling problems. One of the most common causes of poor cooling in a frost free refrigerator is a defrost system failure. In such a case one or the other compartment may appear to be keeping proper temperature but that too may change in a short period of time. The fridge compartment's temperature rise is usually (but not always) the first to be noticed. Frost" and "Ice"
There is a difference between "frost" (a white, snow-like substance) and "ice" (usually clear and solid). When referring to what is seen during an inspection, please keep this distinction in mind as the possible causes for each are often very different. The Defrost System
Inspecting the (usually rear) wall of the freezer compartment for a frost build up is necessary. (In the case of many GE top freezer models, check the freezer's bottom panel.) If there is a frost coating on it, it is often a sign of excessive frosting beneath it. Sometimes however the evaporator cover panel will actually need to be removed (see the illustration below) before an excessive frost build will visible.
The refrigeration system's evaporator (cooling) coil is usually in the freezer compartment. This evaporator will periodically frost over and have to be defrosted by means of a heating system. When the defrost heating system fails, the frost can accumulate to such a degree that airflow throughout the appliance is hampered. There may be just enough air circulation to cool the freezer section but that will eventually stop too.

Sep 28, 2016 | Hotpoint Refrigerators

2 Answers

Side by Side Can't find model # Not cooling enough


Hi,

Cooling is poor For an overall understanding of how refrigerators should work, read about refrigerators in the How Things Work section of our website. A refrigerator or freezer that is cooling, but cooling poorly, may have a problem in one of several areas:

Evaporator coils
Condenser
Poor cooling is often the result of a heavy frost build-up on the evaporator coils or a condenser that is clogged with dust, lint, and dirt.

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.

The refrigerator is supposed to self-defrost approximately four times in every 24 hour period. 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.

Here's an inexpensive, though inconvenient, way to determine if the problem is with the self-defrosting system. Remove all of the perishable food from the refrigerator and freezer, turn the thermostat in the refrigerator to Off, and leave the doors open for 24 to 48 hours. (Be sure to have several towels ready in case the melting frost and ice causes the drip pan to overflow). This allows the refrigerator to defrost "manually." When the frost and ice build-up has completely melted away, turn the thermostat back to a normal setting. If the refrigerator then cools properly, it indicates a problem with one of three components in the self-defrosting system:

  • The defrost timer


  • The defrost thermostat (also called the bi-metal switch)


  • The defrost heater


If it still does not cool properly, there may be a problem with the refrigerant level or the compressor. You may need to consult with a qualified appliance repair technician to further diagnose the problem

Condenser Self-defrosting refrigerators all have a set of coils and a cooling fan, usually under the refrigerator, that need to be cleaned regularly. If these coils get coated with dust, dirt or lint, the refrigerator may not cool properly. The coils may appear to be a thin, black, wide radiator-like device behind the lower kick-panel. To clean them, disconnect the refrigerator from the power source, use a refrigerator condenser brush (see the Appliance Accessories section) and your vacuum cleaner to clean the coils of any lint, pet hair, etc. You may not be able to get to all of the condenser from the front, it may be necessary to clean the remainder of the condenser from the rear of the refrigerator.

Jul 06, 2008 | Roper RS22AQXKQ Side by Side Refrigerator

1 Answer

The fan is working. The fridge, freezer & coils are not iced up. There is good room for air circulation. I vacuumed most of the dust from the coils, etc. The compressor is just slightly warm to the...


Good day to you sir John,


A refrigerator or freezer that doesn't cool well enough may have a problem with its evaporator coils, condenser, or condenser fan motor. Frost build-up on evaporator coils, or condenser coils that are covered with dirt, dust, or lint can reduce how well a refrigerator can cool. If you notice ice getting thicker on the inside walls, inside bottom, or inside ceiling of the freezer, you have what is called a frost build-up. The problem is either with warm, moist air getting in through an old inefficient door gasket or the defrost system. Self-defrosting refrigerators have coils and a cooling fan that need to be cleaned regularly. If the coils get coated with any contaminants, they may not cool the refrigerator properly. The coils are usually thin and black and they go through fins that dissipate heat, just like a car's radiator. They are located behind the lower kick-panel or on the back of the refrigerator. To clean them, turn the power off and use this condenser coil cleaning brush, or this condenser coil cleaning brush, and your vacuum cleaner. Even if your coils are below the refrigerator, you won't be able to get to all the condenser coils from the front, so it's a good idea to pull the refrigerator out and clean the coils from the front and the rear of the refrigerator. Give the fan a dusting as well. Sometimes other things can be the reason behind poor cooling, like the condenser fan motor. Anytime the freezer fan is running, the condenser fan should also be running.
A frost build-up inside the refrigerator usually means that there is a problem in the self-defrost system. You may even have damaged door gaskets. When you open the refrigerator door, you also let in a blast of warm, often humid air. This moisture usually freezes onto the evaporator coils immediately. Self-defrost refrigerators are supposed to self-defrost between two and four times out of every 24 hour time-frame. They basically turn off for a few minutes several times a day. A defrost heater kicks on to melt any frost build-up on these coils, which allows the frost and ice to melt, then it drains off to the pan underneath most refrigerators. Unfortunately, when a defrost component fails, too much frost builds up on the evaporator coils. When this happens, the circulating fan can't draw air over these coils. With no air flow over the evaporator coils, the refrigerator compartment will lose its cool.
To determine if the self defrost system is faulty, it's best to remove all the food from the refrigerator and freezer, turn your thermostat to the Off setting, and just leave the doors open for 24 to 48 hours, and let the refrigerator defrost. Keep an eye out for an overflow of water from the drip pan on the bottom of the refrigerator.
After everything has completely melted away, set the thermostat back to a regular setting. If your refrigerator starts operating properly, the symptoms lead to there being a problem with one of three other components in the self-defrosting system, the defrost heater, the defrost timer, or the defrost thermostat.
If, after testing these components, the refrigerator still doesn't get your foods cool, there may be a problem with the refrigerant level and you will need to contact a professional appliance repair person.

I hope this solution will be helpful...

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Oct 23, 2011 | Frigidaire PLHT217TA Top Freezer...

1 Answer

Hi, Our refrigerator has stopped cooling and I desperately need to try to fix it myself. Lights still come on. Fan or something is still running but the freezer still works so I thought maybe that's what...


There is likely a problem with the defrost circuit or cold air circulating fan (but could be a low freon charge or other problem). The freezer compartment has the cooling coil with defrost heater and a fan that pulls cold air from the freezer and blows it into the fresh food compartment; based on the setting of the thermostat in the fresh food compartment.

When the defrost heater fails, the area that the cooling coil is located in eventually turns into a solid block of frost and ice. It becomes impossible for air to be drawn across the cold coil, cooled and blown into the fresh food compartment. The result is a rising temperature in the fresh food compartment - and eventually in the freezer section, too. Since the fresh food compartment contains the thermostat and the temperature never gets low enough to satisfy it - the compressor runs non-stop. That is, until the defrost timer kicks in to shut it off for 20 minutes or so.

The first thing to do is to manually defrost the freezer by accessing the cooling coil after emptying the contents of the freezer. This can be a pain in the neck to remove racks, shelves, ice maker, etc. to get to the back wall of the freezer, behind which the cooling coil is found. If you expose the cooling coil and it is encased in frost and ice it is a problem with the defrost circuit. If it is not - the fan is suspect. If the fan spins, check for a blocked path between the fan and the fresh food compartment. Defrost by placing a heat source in the freezer or directing the output of a blow dryer at the coil. If you're unable to access the cooling coil, you can simply empty the freezer and defrost it with a heat source. it will take longer to melt all the frost and ice, but it will work.

If it is a defrost circuit problem, you'll need to check voltages and continuity on the defrost terminator & timer and defrost heating element, fans, etc. after completely thawing the ice & frost.

This job isn't a good first time DIY job due to the danger of freezing skin, etc. due to possible exposure to freon in the system and the tight spaces you'll be working in with live voltages. You might want to call a pro after you've defrosted or put up another fixya request if you decide to dig in on your own and need specific help with procedures, locating parts, wiring diagrams, etc.

I hope this was a good starting point to help you decide whether to go forward or not on your own. Good luck!

Oct 07, 2010 | Kenmore Refrigerators

1 Answer

The refrigerator side is only getting down to 50 degrees. the freezer is down to 0 degree. unit is about 2 yrs. old.


There is likely a problem with the defrost circuit or fan (but could be a low freon charge or other problem). The freezer compartment has the cooling coil with defrost heater and a fan that pulls cold air from the freezer into the fresh food compartment, based on the setting of the thermostat in the fresh food compartment. Before you dig into that, you should vacuum the condensor coil to remove dirt and dust that always collects on it. It that solves it - you're done. Otherwise, continue.

When the defrost heater fails, the area that the coil is in turns into a solid block of frost and ice. It becomes impossible for air to be drawn across the cold coil, cooled and blown into the fresh food compartment. The result is a rising temperature in the fresh food compartment - and eventually in the freezer section, too. Since the fresh food compartment contains the thermostat and the temperature never gets low enough to satisfy it - the compressor runs non-stop. That is, until the defrost timer kicks in to shut it off for 20 minutes or so.

The first thing to do is to manually defrost the freezer by accessing the cooling coil after emptying the contents of the freezer. This can be a pain in the neck to remove racks, shelves, ice maker, etc. to get to the back wall of the freezer, behind which the coil is protected. If you expose the cooling coil and it is encased in frost and ice it is a problem with the defrost circuit. If it is not - the fan is suspect. If the fan spins, check for a blocked path between the fan and the fresh food compartment.

If it is a defrost circuit problem, you'll need to check voltages and continuity on the defrost terminator & timer and defrost heating element, fans, etc. after completely thawing the ice & frost. This job isn't a good first time DIY job due to the danger of freezing skin, etc. due to possible exposure to freon in the system and the tight spaces you'll be working in with live voltages. You might want to call a pro after you've defrosted or put up another fixya request if you decide to dig in on your own and need specific help with procedures, locating parts, wiring diagrams, etc.

I hope this was a good starting point to help you decide whether to go forward or not on your own. Good luck!

Aug 09, 2010 | KitchenAid (KSRD22FKST) Side by Side...

1 Answer

Where is the defrost thermostat? fridge doesn't cool but freezer does


Good day,
If your talking about the defrost thermostat, it should look something like this.

dfeadd5.jpg
In the freezer compartment, remove the rear panel. You should be looking at the cooling coil.
The thermostat is clipped to the top of the coil, usually on the right side.
The heater is mounted to the same coil but is mounted to the bottom of the same coil. To check the heater you will need an ohm meter. It should read no more than 30 ohms and appear in good condition.
Testing the thermostat is a little different in that it must be tested while still cold. It should test out at zero ohms (no resistance).

If both check good the last item is the timer which is located in the fresh food compartment on the top. There is a hole where you can insert a screw driver to advance it. It will only turn clockwise.
With the machine running, turn it until the machine shuts off. Leave it like that. If the machine turns itself back on within 35 minutes, the timer is O.K. If not, the timer is bad, and must be replaced. All 3 items can cause the machine to allow the cooling coil to frost badly enough to deny the fresh food compartment any supply of air.
Also, the fan motor in the freezer section, if not running can cause the same problem.
Here's a good tutorial on defrost systems.

http://www.appliance411.com/faq/howdefrostworks.shtml

Jun 09, 2010 | Magic Chef CTF1925 Top Freezer...

1 Answer

Poor cooling in the freezer compartment


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. The refrigerator is supposed to self-defrost approximately four times in every 24 hour period. 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. Here's an inexpensive, though inconvenient, way to determine if the problem is with the self-defrosting system. Remove all of the perishable food from the refrigerator and freezer, turn the thermostat in the refrigerator to Off, and leave the doors open for 24 to 48 hours. (Be sure to have several towels ready in case the melting frost and ice causes the drip pan to overflow). This allows the refrigerator to defrost "manually." When the frost and ice build-up has completely melted away, turn the thermostat back to a normal setting. If the refrigerator then cools properly, it indicates a problem with one of three components in the self-defrosting system: The defrost timer The defrost thermostat (also called the bi-metal switch) The defrost heater If it still does not cool properly, there may be a problem with the refrigerant level or the compressor. You may need to consult with a qualified appliance repair technician to further diagnose the problem

Mar 29, 2010 | Refrigerators

1 Answer

Freezer works fine.. no or barely any cool in fridge. no compressor sound


Good day,
If the freezer is working then there is no issue with the compressor. The cooling is all performed in the freezer with a small amount of freezer air bleed into the fresh food compartment to cool it. All machines are designed this way.

First, check to see if you can hear the fan motor running in the freezer compartment by opening the freezer door while it is running and listening. If you can't hear it, remove the rear panel inspect and replace as needed.
If the fan is O.K. then look on the bottom half of the rear panel in the freezer compartment for a frost buildup. If so, your defrost system has failed.
You will need to remove the back panel and defrost the coils.

The defrost system is made up of 3 components. The main defrost heater, mounted to the bottom of the cooling coil, the defrost thermostat (a small round disk about 1" in diameter) clipped to the top of that same coil and lastly, a defrost control mounted in the roof of the fresh food compartment and can be a timer, electronic defrost control, or a electronic module.
The main heater rarely fails, the last 2 are usually the culprits,
and should be replaced as a pair.

Your problem must be one of the 2 I've listed, unless for some reason the light switch failed in the fresh food section, and the lights stay on all the time.

Below is a good tutorial on defrost systems. Best I can do without a model number and style.

http://www.appliance411.com/faq/howdefrostworks.shtml

Mar 02, 2010 | Frigidaire Refrigerators

1 Answer

The fridge is not cooling the food and especially dinks .the cooling setting is on max


Good day,
General problems.
1. The coil in the freezer is frosted up, preventing air from being
sent to the fresh food compartment. (defrost system not working).
Three parts. Defrost control, defrost thermostat, main defrost heater.
2. The fan motor in the freezer is not working, or working properly. Same results as #1.
3. The damper control that vents air from the freezer to the fresh food compartment is not opening (pneumatic style).
4. Lights stay on when the door is closed.

Best we can do without a make and model number.

Nov 11, 2009 | Refrigerators

2 Answers

Coils keep freezing up its 4 years old


Iced-over evaporator coils, accompanied by a non-chilled fresh food compartment, happened in my GE side-by-side (model GSS20IEMDWW). For me, the problem was caused by a faulty temp sensor in the fresh food side. That sensor never signalled the computer that the temp in the fresh food side was cool enough, so the compressor ran constantly.

Since the compressor was running constantly, the evaporator coils (back wall of the freezer compartment) eventually iced over (took about a week). Since the fan that draws air over the evaporator coils could no longer move any air (due to the icing), the temperature in the fresh food side got warmer as well.

The fresh food side is chilled through a hole with a motorized door at the top of the dividing wall between compartments which opens when the fresh food side needs cooling. If no air is moving in the freezer compartment, temps in the fresh food compartment climb.

I replaced the temp sensor in the fresh food side and solved the problem for a while.

I bough a pair of thermometers at a kitchen store and put one in the freezer compartment and one in the fresh food compartment so that I could occasionally check to see if it made sense for the compressor to be running (ie, was it really necessary to be trying to cool either compartment, or were they already cold enough).

About six months later I had the coil icing problem again. This time the fresh food side seemed cool enough (according to the thermometer as well as the fact that the flapper door would close, indicating that the computer knew to not try to additionally cool the fresh food side).

The thermometer indicated that the temp in the freezer compartment was cold enough, but the system computer continued to run the compressor. So I replaced both temp sensors in the freezer compartment - which solved the problem again. (My fridge is about seven years old.)

If you are going to replace any of the temp sensors, replace them all under the principle of "if one failed, the rest will soon fail too".

Use a website like www.partselect.com to look up a parts diagram for your fridge and see if you can order just the temp sensors. Other websites (www.repairclinic.com and www.appliancepartsworldwide.com) may also be helpful. I have no affiliation with any of the sites I just mentioned - I'm just posting them as resources.

Jul 30, 2009 | GE GSS20IEP Side by Side Refrigerator

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