We also have a 2017 3820FK, our furnace had similar issues in fall of 2018 in Sedona AZ, after numerous tests we ended up with a mobile repair tech because i couldn't find the main board online to buy. Tech replaced it with our extended warranty and we haven't had any issues since.
We camp and travel in various environments, the tech advised i routinely use low pressure air and blow out sand and dust, which i have been doing twice a year.
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Rick & Joyce Jones
RMC(SW) USN Ret.; AT&T Ret.
2024 3231CK, IS, 400W Solar, Slide covers, Predator Gen,, 2016 Chevy High Country 3500 Diesel Dually
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