I had a similar problem with our heater. Cause was water under the heater control board, usually after it rained. See the attached post for a description of how I solved it.
Thor Forums - View Single Post - Rainwater leaking in furnace
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Rick
2017 Thor ACE 30.1
2017 Jeep Cherokee Trailhawk
Roadmaster Falcon All Terrain
RVi Brake 3
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