Bad Control Board?


  #1  
Old 10-01-09, 05:51 PM
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Bad Control Board?

Nordyne gas furnace. On call for heat the inducer fan comes on before the board checks for "pressure switch stuck closed ". Seeing the pressure switched closed the board terminates the startup with LED flashing the code for "pressure switch stuck closed"
. I confirmed that the pressure switch does infact open and close when inducer stops or starts.
I also removed a wire from the pressure switch. On call for heat, board correctly showed "pressure switch stuck open"
I would think the control board is faulty.
Opinions?
thank you
 
  #2  
Old 10-02-09, 10:59 AM
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I think you made a correct diagnosis.
 
  #3  
Old 10-03-09, 05:42 PM
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Update info.
I removed the board and found several cracked solder connections. I repaired these and also moved a bent over component pin that may have been too close to another one.
Reinstalled the board and so far all is well. Feels sortof like finding 200 bucks on the sidewalk.
 
 

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