I have the same problem down here in Arizona. Furnace hasn't worked since early February. Replaced the switch over regulator and the red 30 PSI regulator. When the furnace tries to light the green indicator turns to red. Had tanks topped off, to no avail. The sail switch is located inside fan housing according to drawings so can't take out and check. Little red led blinks once. Tried lighting furnace once again recently and furnace ran longer, 10 seconds and shut down again. Don't know what to do.
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