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Re: furnace in a 1989 coachmen by Robert Willbanks
Post New Message The fan sail switch may be dropping because the blower rpm is not enough to keep it in the closed position.
It requires a pretty good air force to keep the switch closed. The closure is a safety circuit to shot off the burner.

Another possibility is low propane pressure. Again part of the safety is having a flame high enough to keep the thermistor hot, if the thermistor is too cool that will cause the propane to be shut off also.

Bad grounding is often the culprit in these cases. Even if the ground wires look Ok I usually separate the connections and clean the terminal and reinstall making sure that the connection is clean and tight.
Good Luck
All Messages in ThreadAuthorDate
Post New MessageFurnace in a 1989 coachmen Bob Sultze 3-7-10  
  Reply to MessageRe: furnace in a 1989 coachmen Robert Willbanks 3-14-10  
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