Centrifugal switch stuck open, replaced, now stuck closed

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Centrifugal switch stuck open, replaced, now stuck closed

Postby honestmike » Tue Dec 23, 2008 4:38 pm

I have a Coleman Evcon furnace model DLAS075BDO (last digit could be a "D") which has had a finicky centrifugal switch for several years. Each new cold season, it wouldn't start and the error light would flash 3 times indicating it was stuck open.

When I tapped it, it would start up and everything would be fine as long as I used the furnace regularly. If it wasn't used for a few days, it would stick open again.

I finally decided to replace the whole unit (centrifugal switch and motor assembly) which I ordered through this site (mobilehomerepair.com).

The new unit appears to be doing the same thing, except it fails to start up every single time unless tapped, and the error light is flashing twice indicating the centrifugal switch is stuck "closed".

The voltage reads about 22 volts (my meter could be slightly off) at the circuit board, so I'm not sure what to check next.

Ideas?
honestmike
 
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RE: Centrifugal switch stuck open, replaced, now stuck close

Postby Robert » Fri Jan 02, 2009 3:48 am

Do you still need help ?


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Robert
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RE: Centrifugal switch stuck open, replaced, now stuck close

Postby honestmike » Fri Jan 02, 2009 2:40 pm

Yes, I still need help most definitely.
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RE: Centrifugal switch stuck open, replaced, now stuck close

Postby Robert » Fri Jan 02, 2009 3:19 pm

Hi,

That code is not always the fault of the switch or motor. Could be a problem with air pipe obstruction also.


Could be a faulty board giving false code.


The only way to know is to understand the circuits and sequences and thoroughly test one by one.




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Robert
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