Quote:
Originally Posted by Doctarie
Well I think I have resolved my furnace problem , after two wrong boards that was supposed to work in mine a new board has remedied the problem . I have become good at taking the furnace in and out ! The old board must have had a cold solder joint or bad resistor , or something as it would work fine sometimes but when it quit it did not run for several hours . At one point I had decided it was the thermostat as it stopped but was still calling for heat . But not the case , if I ever go through this again I will make myself a bench test set up and solve it out side of the camper . Hope this might help someone else and thanks gang for suggestions and interest !
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Good job!
I know what you mean about repeated removal/reinstallation. On the first one I worked on, I must have had it in and out a dozen times.
Bench testing would have not helped resolve my problem. In that case, the furnace would light and operate perfectly every time with the front plenum cover off. (That's the first cover you see after you take the return air grille off.) If that cover was on, the furnace would never light.
It turned out that the propane regulator had gone bad. I had bypassed the first troubleshooting step, test the pressure, because I didn't have a measuring tool. Finally, after wasting hours, I built a manometer--it took $5 in fittings, some scrap from my workshop, and less than an hour. I still have it.
My guess is that the furnace behavior varied with the cover off because the same motor drives the combustion impeller and the circulation impeller. Their rotational speeds must have varied due to lower air resistance with the plenum (circulation) cover off.
Linear Mode
