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sub zero 501f freezing up


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22 replies to this topic

#21 rat454

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Posted 15 November 2010 - 05:52 PM

I've basically figured out the terminator is bad causing the evap to produce ice uncontrolled.  My defrost timer, drain tube heater and trough heater are all ok.  They all heated up on the defrost cycle.  The evap heater wouldn't heat up cause the terminator was not working.  I tested the terminator by setting it in a bed of ice and it continued to be open meaning no current flow.  I however will replace the terminator and the trough heater cause its coming apart and has no more good sticky stuff on it to keep it stuck to the trough.  I won't be able to test the evap heater until i get the terminator.  Oh also i will replace my ice maker.   Will post results.

Thanks for the help DrFrige and RegUS. 


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#22 RegUS_PatOff

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Posted 15 November 2010 - 09:50 PM

[user=72560]rat454[/user] wrote:

...  I tested the terminator by setting it in a bed of ice and it continued to be open meaning no current flow.... 

yes, then it's bad...

only alows current flow when it, and the Evaporator, are cold

once the Evaporator frost melts, the Defrost Terminator is no longer cold and it then opens ...

You could test the Defrost Heater, by bypassing (jumpering) the Defrost Terminator for a few minutes ...

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#23 rat454

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Posted 16 November 2010 - 08:29 AM

Does the heater kit include a defrost terminator.  Looks like one in the picture.  Called supplier and they didn't have any details on the components.

 





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