Suburban Furnace Problem

sandpaper600 wrote:
@dougrainer - I think you may have solved it! Nobody ever mentioned anything about this wiring needing changed and I bought the board from the same people. I have even had email dialog with them about this problem.

I'm curious about the info in caps. Where did you find that? I followed the link and looked around for other websites selling the 520839 kit, but can't find it.

Thanks very much for your efforts in this. I'm going to order this and I'll post back after I get a result.

It was simple. You stated the original P/N and the replacement. I went to my sources and NONE had the correct older replacement. BUT, the replacement you purchased did NOT state it would work for a SP model. ONLY S model. This was confirmed by various part suppliers. THAT raised a red flag for me. So, I researched and found that your new model required a extra wire kit. The caps was because that is how I copied and pasted when I found the solution. Once I found a supplier that listed the correct SP board(your new board) it stated you had to have the wire mod kit. If I was at work, I would have called Suburban and asked what was the correct Board number and they would have told me with the proviso to get the wire kit. Doug

Per Suburban, you need the wire kit because you have 2 fan relays interfering with each other. A Time delay and the built in on the module board. The wire kit goes around the time delay relay.