We just experienced the same thing for the 2nd time in the past couple of years. Each time, replacing the thermostat with a new one fixed the problem. Resetting, etc. did nothing. The first replacement lasted about 2 years before the problem recurring.
When it happened again about a week ago, the wall it was attached to was very hot from the sun and we found condensation on the back of the thermostat. The hole behind the thermostat is fairly large and there is a metal bar in the wall that was extremely hot. We decided to close that hole up as much as possible and mount the thermostat where it isn't exposed directly to the insulation through the hole in the wall to hopefully protect it from extreme temperatures.
We intend to carry a spare with us from now on as we might not be near a place with parts the next time it happens.
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2016 Newmar Baystar 3124
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