If you're on propane....
I would suggest a good cleaning. Remove the drain and blow out/flush any sediment that may have built up. If you wash out any corrosion then the gas valve may need to come out for inspection also as the t-stat operating coil is part of the gas valve.
Alan
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Alan
2005 T139FK
1995 Chevy G20 aka "Big Blue",
1994 GMC Camper Van,
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