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calumet flash  
#1 Posted : Tuesday, March 22, 2011 4:20:25 PM(UTC)
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calumet flash

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Freezer will not defrost. Is it a simple fix by replacing the timer board??
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denman  
#2 Posted : Wednesday, March 23, 2011 2:53:27 AM(UTC)
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denman

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Here are your parts
Replacement parts for 596-72282201 models | AppliancePartsPros.com

Look under the unit for the tech sheet. It may also be paped to the inside of the back cover. It will tell you how to force a defrost. You will nknow youn are in defrost when the compressor and fans shut off.

Here is some info on forcing a defrost if you cannot find the tech sheet.
http://www.applianceaid.com/adaptive_defrost.html
Try the Amana procedure and if that does not work try the last procedure.
[COLOR="DarkRed"]
Is it a simple fix by replacing the timer board??[/COLOR]
It is relatively simple just not that simple.

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, the fans and compressor turn off.
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 timer needs replacing.

If not on.
Unplug the unit.
Remove the wire for one side of the heating element from the wiring and measure it for continuity, usually around 20 ohms or so.

If the heater is OK
Remove one wire to the defrost thermostat 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 board is 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.
THIS FORUM IS DEAD!!!!!!!
calumet flash  
#3 Posted : Wednesday, March 23, 2011 6:20:56 AM(UTC)
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calumet flash

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Joined: 3/22/2011(UTC)
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Thank you for the information. I will try all that you suggested.
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