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On mine I noticed a drop in voltage to 3 volts from the circuit board to the high limit switch - but only occurred with temps below 40 degrees. By applying heat (heat gun) to circuit board the voltage would come back to 12 volts due to bad circuit board solder joint. I had 12 volts from circuit board to the sail switch at all times.
Furnace would light but go out after 3-4 seconds, fan continues to run, furnace relights, continuous process
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Kevin & Pat Moody
2020 Montana 3701LK, Legacy Package, Satellite, Solar, Generator, 2019 Ford F350 Dually, BD5F Trailer Saver, 12' Trailer with Kayak Rack, Polaris General XP 4 1000
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