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The only thing I know is... the Shadow Knows, I am one of the lucky ones as I have outside easy access.
Four screws and off pops the exhaust tube.
Four screws and off pops the access cover, exposing the entire works within.
After that, it may be fainting time once the furnace and controls are exposed.
Not to worry, looking on the blower housing, two screws and out pops the "Sail Switch"
Further inspection will reveal the "high limit" switch.
After locating these two possible problems some folks may only be able to do a visual inspection while others will be able to test the actual performance of the two switches. Sometimes a visual may be all that is needed. Dirt, a loose connection, or even a broken wire may be the reason for your malfunction.
In my case, there must have been a bad connection, although the "sail switch" is pretty sloppy and really cheap to boot. But anyway, I checked all connections and checked the safety switches using a multi-meter.
My problem must have been a bad connection because I fired the unit up and it fired right off. Tonight will be the time for the true test. Lows will be in the upper 40s. Not to fear, I have my trusty electric heaters on stand-by.
I would like to mention also, my furnace looks to rely on a "chassis ground" and I do not like that option. If my problem persist, I will wire a ground back to the battery.
Hope this may be of some help to others in the future.
Be well and safe travels.
Linear Mode
