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I have an old furnace that is not working properly, a Carrier model 58SE150-3 series 314 from 1975.

I have diagnosed the problem to a likely fused fan blower relay. In looking over some of the other forum posts people seem to recommend that I not replace the relay directly (a Potter and Brumfield KU-5399). Instead, the advice seems to be do replace the entire circuit board.

So, first off, is it true that replacing the entire circuit board would be the recommended approach? And if so, where can I go to find a replacement board? This is obviously an old model, and I have had trouble locating a site that sells a replacement board
 

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try Americanhvacparts.com or Supplyhouse.com

That is very old and eventually parts can go obsolete from a lack of demand.
 

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Honeywell makes a universal replacement board that will fit plenty of the old furnaces. Don't have a part number right offhand but if the above sights listed don't help you I will get a part number for you
 
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