DuoTherm 901 Series Furnace
I have an 86 Winnebago and am having an issue with the heat. It is a Duotherm 901 series, it works off the LP system. When I turn the heat on the fan will start blowing then it will light but only st...
Forum Discussion
1. Duotherm took that model off the market after a few years, because they had the exact same problem you have
2. They will work on the bench but when installed they do just what you experience. We do NOT even work on them and there have been no parts available for over 20 years. If we have a trade in (rare to keep a unit this old for sale), in years past, we replaced the furnace because we KNEW you could not be positive that we could not guarantee that the unit would run correctly
3. The problem was the burner design and the static (case) pressure was the culprit. You could leave the inside access door OFF and the unit would fire and run, install the door to force the air thru the ducts and it would misfire or just quit heating. You can play with it all you want, but it will never work correctly. Doug
2. They will work on the bench but when installed they do just what you experience. We do NOT even work on them and there have been no parts available for over 20 years. If we have a trade in (rare to keep a unit this old for sale), in years past, we replaced the furnace because we KNEW you could not be positive that we could not guarantee that the unit would run correctly
3. The problem was the burner design and the static (case) pressure was the culprit. You could leave the inside access door OFF and the unit would fire and run, install the door to force the air thru the ducts and it would misfire or just quit heating. You can play with it all you want, but it will never work correctly. Doug
