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The unit is 3 years old. About 4 months ago, the fridge started to freeze food: milk started to ice,

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Old 03-22-2011, 05:28 PM
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Default Amana freezer frosting
Model Number: afb2534deb   Brand: Amana   Age: 1 - 5 years   

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The unit is 3 years old. About 4 months ago, the fridge started to freeze food: milk started to ice, etc. We turned the fridge temp up a bit and stopped putting as much stuff in it and the problem seemed to go away.

About a month ago, we noticed that the freezer was not keeping ice cream completely frozen, though other foods seemed to be okay. Last week the ice maker stopped working (I replaced it about 6 months ago.) I noticed that there is frost buildup on the back inside panel of the freezer. Tonight, I cleaned the coils underneath from the front.

Read on forums that it might be a defrost timer issue, but see no defrost timer listed for my unit. Any ideas on what is going on would be much apprecitated.


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  #2 (permalink)  
Old 03-23-2011, 05:50 AM
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Here are your parts
Replacement parts for afb2534deb models | AppliancePartsPros.com

See the attachment for a tech sheet for a DEB3.
It should be a close if not the same as yours.

Your unit does not have a defrost timer, defrost is run from the main control board.

Your earlier problems may have been due to a thermistor or the control board.

Sounds like your current problem is a defrost problem.

First remove the evaporator cover in the freezer so you can see the coils.
Do not let them de-ice.
If they are heavily iced/frosted over you have a defrost problem.

If yes.
Manually force a defrost cycle (see the tech sheet). The fans and compressor turn off when in defrost.
Now check the defrost heater to see if it is on.
Be careful you do not want to burn your fingers.
If the heater is on then the board needs replacing.

If not on.
Unplug the unit.
Remove the wire for one side of the heating element (Item 15 in Section 4) from the wiring and measure it for continuity, around 30 ohms.

If the heater is OK
Remove one wire to the defrost thermostat (Item NI in Section 4 ) and measure it, should be 0 ohms when frozen. Note that it opens just above freezing so must be frozen to check it. Also inspect it, if it is bulged at all replace it even if it measures OK.

If both the above are OK then odds are the defrost timer contacts are toast.
Best way to test this is a live test to see if you have 120 volts across the heater/defrost thermostat combo.

If you do not own a meter, I would suggest you purchase a one. You can get a decent digital multimeter for under $20.00. You do not need fancy though it is nice if the leads are a couple feet long.
If it saves ordering one unnecessary part it has paid for itself and you end up owning a useful tool.
Most places will not let you return electrical parts so if you order it, you own it.
A couple things to watch when measuring ohms and continuity
1. Always remove power from the machine otherwise you could blow your meter.
2. Always disconnect at least one side of any device you are checking. This eliminates the possibility of measuring an alternate/parallel circuit path.
3. When checking for closed contacts and continuity use the lowest scale (Usually 200 ohms). Then try higher scales. This scale is 0 to 200 ohms so if the device you are measuring is 300 ohms this scale would show an open circuit which it is not, you are just measuring outside the scale's dynamic range.

There is a good STICKY at the start of this forum about it's use.
Attached Images
File Type: pdf AFB2534.pdf (206.4 KB, 79 views)
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Old 03-27-2011, 10:02 AM
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I have an ABL2037FES (3 years old) which is also having freezer frost issues.
My coils are heavily frosted.
I forced the heater on in service mode and it does turn on properly.

Does this now point to the control unit or the thermistor?
Is the thermistor the one sitting on the back panel or the one clamped onto the coil?

What should I try next (or replace)?

Last edited by AppCanuck : 03-27-2011 at 10:15 AM.
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Old 04-05-2011, 05:09 PM
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Thanks for the great info and excellent links!
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