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Amana AFD2535DES Defrost - 1 or 2 problems?

8 posts in this topic

 

Amana Refrigerator AFD2535DES not defrosting.

 

  1. Ran internal diagnostics that indicate defrost thermostat "O" (open), therefore should be bad. Not confident of my beginner multimeter skills, but seems to confirm no continuity (I put it in ice water for the test, not sure of my leads making good contact inside connectors.)
  2. Also put in forced defrost mode which didn't sound like it cut off compressor (but did turn off evaporator fan). This would indicate the Jazz board is bad.
 

So are both these parts bad, is that not unusual? or:

 

  1. Would a bad defrost thermostat that prevents entering defrost mode cause the board to not fully enter forced defrost mode and not cut off the compressor?
  2. Might a bad board give me a false error result telling me that a defrost thermostat is bad when it is really OK?

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You are giving us diagnostic info but not the symptoms. Techs abhor giving advice in a vacuum but I'll do the best I can

Ice water test is usually reserved for thermistors and not for limits. I think your limit closes at 20f, far below Ice water temp. With regards to your diagnostics saying the limit is open, it depends on the temp of your freezer. I think your limit opens at 40f and closes at 20f. To test limits, you can blast a limit with cold air from an upside down can. of compressed air.

Can a bad limit cause the compressor to stay on during forced defrost.. no

Can a bad board give misleading info? .. certainly.

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With the refrigerator on - I believe you can turn the temps up or down until it reaches '0' flashing on the control (indicating the fridge should be off). If you still hear the compressor running with the fridge off -chances are the relay on the board shorted and you need a new board.

I only mention this because you said the compressor is running in forced defrost mode.

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With the refrigerator on - I believe you can turn the temps up or down until it reaches '0' flashing on the control (indicating the fridge should be off). If you still hear the compressor running with the fridge off -chances are the relay on the board shorted and you need a new board. 
You are giving us diagnostic info but not the symptoms.

 

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I guess I can't edit my premature post above.  

 

Anyway, this is weird. I turned frig off on control, compressor went off.  Then tried forced defrost again, compressor went off! So then I tried the internal service diagnostic (position #1) for the thermostat, that now gives an "S" not a "O"!!

 

So maybe the board is going bad, or maybe it rebooted itself (I don't know if defrosting it manually had some effect, or just from powering off, or both) but it all indicates working normally now.  I won't know for sure until it remains frost free - how long would that be, at least a few days? longer?  I guess I can check if the heater comes on in forced defrost mode, but that requires getting behind the panel again, easier to just wait and cross my fingers.

 

As far as original symptoms, freezer was working fine, frig warm.  Evaporator fan and damper working normally. Excessive frost buildup.

 

Thanks for the responses!

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or maybe moisture on the board?

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jazz board failure... it will happen again.

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Compressor running during defrost is one of the classic jazz board failures.  Details on testing and replacing thje jazz board here: http://appliantology.org/blog/1/entry-650-how-to-test-and-replace-the-adc-jazz-circuit-board-in-maytag-and-amana-refrigerators/

 

Replacement jazz board:  http://www.repairclinic.com/PartDetail/Main-Control-Board/12784415/1541423

 

Comes with a 365-day, no-hassle Return Policy:  http://www.repairclinic.com/Layer/Return-Policy

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