Probably a loose wire, thermocouple lead, or even a loose connection at the heater vent between the vent and the flexible hose. I once had a hose that was torn, but never knew. We were heating the area under the cabinet where the hose was located, and any airspace connected with that cabinet. Nice and toasty under there, but the furnace was operating way too long to heat our old toyhauler trailer. It could be the cause of the thermostat immediately heating up two degrees. You may be heating the air inside of the wall where the thermostat is located. At the very least, it could have been a loose electrical connection as well, so that as it all heated up, it lost adequate continuity, and hence voltage, to keep it all operating properly.
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2006 Jayco Seneca 34SS
2006 Jeep Wrangler Unlimited Rubicon Toad
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