Furnace sail switch

[Kenmartin1]

I have a 96 thor residency 36' motorhome that has been sitting for a few years. Has front and rear furnaces, ignition style atwoods. Upon starting, both furnaces fan's run strong, but wouldn't light. I bypassed the sail switch and both furnaces operate properly. I removed a sail switch and tested it for continuity, and it works! My fans seem to be blowing strong out of all floor vents... Do these switches get stiff or stuck when old???

One other question: I can find a power transfer switch, or converter, if anyone knows where they may be hidden. Thanks, Ken

[bsinmich]

Try running one furnace at a time. That should give a little higher voltage for the fan. If that helps you have a battery voltage problem. You could also measure battery voltage when the furnace is running.

[Kenmartin1]

Thanks, I'll try the pb. I have really good batteries.

[YC_1]

They may need a little PB as suggested and some exercise. The heaters require sufficient voltage for the fan motors to run fast enough so I would measure the DC voltage at the heater. Since both have failed the common thing is DC voltage.

[Mike_Hohnstein]

I've had sail switch's get sticky, sometimes a little PB will loosen them up.

[1492]

Moved from Forum Technical Support