Dear cold, I can identify with your problem. It sounds to me like you have done everything that I would suggest except change the control board. I would recommend that you contact Grainger supply at www/grainger.com with your furnace model no and part number if possible. I ordered a lot of parts from them when I was running my business. We are in central Ks. so I could get parts out of Wichita in a couple of days.
They can give you nearest location to you and I was always pleased with everything I got from them but the bill. They have a wide selection of dayton furnaces and parts and knowledgeable sales staff. I hope this helps you and thanks. Happy holidays.
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