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Furnace in a 1989 coachmen Bob Sultze 3-7-10  
I have a 1989 coachmen travel trailer.
the furnace has a auto lite.the furnace runs but after like 3 cycle the burnner does not relite and the fan stays running and the temp. will just drop.I have to shut off the furnace and restart. it will run for one sometimes 3 or more cycles and then just stay on fan. I've changed the thermostat still samething. the thermostat has the on off switch also.
Re: furnace in a 1989 coachmen Robert Willbanks 3-14-10  
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
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