Question about Nor-Lake Freezer Norlake Refrigeration 6' x 6' Kold Locker Walk-In Freezer - 6' 7'' High w/Floor

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Refrigerator is not cooling

Frost has built up on my 7 yr old Amana 'bottom freezer' rear/vented freezer wall. 1 month ago vacuumed/cleaned the filthy condensor coils on the bottom and manual defrosted. worked fine but now frost has returned and refrig is warm.

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Good day,
You will need an ohm meter to check the parts.
Your defrost system has failed.
It is made up of 3 components, 2 of which are located behind the rear panel in the freezer compartment.
Remove the rear panel. There is a cooling coil, that has a calrod heating element that runs along it's bottom. As well there is a defrost thermostat ( a small round 1" disk) which is located on the top of the same coil. Both should be checked with an ohm meter to test for continuity. The heater should read no more than 30 ohms, the thermostat ( IT MUST STILL BE COLD BELOW 30 DEGREES) should read zero ohms. Note: The heater rarely fails, the thermostat has a high failure rate.

The third item is a timer, or a solid state adaptive defrost control. Depending on age, and model, it is located , behind the kick plate on the bottom front.
Or, in the fresh food compartment on the roof.
If it is a timer, you can turn the timer shaft when the machine is running until the machine shuts off. With it still turned on, wait 40 minutes.
If the machine turns itself back on, the timer is O.K. if not, the timer is bad, and needs replaced.
If the Main heater checks O.K. and it has a solid state control, then replace the thermostat in the freezer compartment, and the solid state board.

Below is an excellant tutorial on defrost systems.

http://www.appliance411.com/faq/howdefrostworks.shtml
Thank you for using FixYa

Posted on Jan 20, 2010

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Posted on Jan 02, 2017

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1 Answer

Frost builts up in the coils


Frost will normally build up if you do not have frost free freezer and in which case it is possible the frost free system is faulty. If it is not frost free then it has to be defrosted a few times in a month. However if the frost comes up very quickly then there are possible causes.
You may be having leakage from the door seals or there are items in the freezer that are not properly covered to avoid moisture escaping. Other possibility is that your freezer is set too cold and there are not many items in it.

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Botttom will not cool but top cools


Do you see frost built up on back wall of freezer if so it is not defrosting and this is what needs to be checked, remove back wall of freezer and check these;
Defrost heater-- it usually is at bottom of the evap. coil, to check it remove wires to it ,use a meter set to the lowest ohms setting and check for somewhere between 10-50 ohms if that is what yours is its good if meter reads OL replace defrost heater

Defrost thermostat-- if clips to the top of the evap. coil and is metallic,round , about the diameter of a quarter with a plastic side with 2 wires coming from it(do not confuse it w.thermister),remove wires and check for ZERO ohms WHEN TESTING IT MUST BE COLD so check it when frost is built up,IF meter reading is OL (WHEN COLD) its the problem

Defrost timer or defrost control if has digital display to show tempature
check timer(it could be anywhere except in freezer) by turning till you hear a click,the defrost heater should come on within 5 minutes if the heater does come on the timer is the problem and needs to be replaced,if the heater does not come on the above mentions parts (heater/t-stat) will be the problem.
defrost control is hard for unskilled lay persons to check SO IF heater and defrost t-stat are good replace control

Hope this helps,

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Good day,
Somewhat handicapped not knowing if it's a conventional freezer or frost free.
1. If it's frost free check to see if the fan motor is running in the freezer compartment.
2. As well if it has a fan motor in the compressor compartment, see if it is running as well.

3. If it is a conventional model, make sure it is turned on and make sure it is running. If running, then it has lost it's refrigerant charge or the compressor has lost it's pumping capacity.

4. If it is item 3, then unless it's less then 5 years old, the sealed
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1 Answer

1999 Frigidaire Refrigerator


Check rear wall of freezer by feel for frost. Heavy, even frost indicates likely problem in the defrost system. Unplug unit. Defrost heater (in freezer behind rear wall panel), defrost thermostat (same area-must be checked at freezer temperature) or Defrost timer-located lower back outside of unit. Near compressor. Do continuity test on heater and defrost thermostat and if they show continuity (good), replace defrost timer. If not, replace the one that tests bad.

Defrost coils fully. Reassemble.

Please let me know if I have helped with comments and rating.

Refrigerator will work about 7-10 days after being defrosted until thick frost builds up again cutting off air flow to both compartments

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HI,

If the refrigerator isn't cool, you need to answer some questions, then see if the compressor is running.

First, answer these questions:

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  • Is the thermostat knob turned to the proper setting? If not, reset it.


Next, see if the compressor motor is running

The compressor is a football-sized case with no apparent moving parts. It's on the outside of the refrigerator at the back near the bottom. If it is humming or making a continuous noise and your refrigerator is still not cooling, there may be a more serious problem with one or more of several different components, we recommend contacting a qualified appliance repair technician for further help.

If the compressor is not running but you do have power to the refrigerator, there may be a problem with one or more of these:

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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:

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  • 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

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Hi, If you had ice, there is a drain plugged in the freezer. If you had a frost build up, there is a problem with the automatic defrost.

I can help in either case. Please let me know if you need more assistance.
Thakns
Vic

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This is the moisture coming out of the food. It is what causes freezer burn.

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