Our new 16 coachmen leprechaun 317sa few issues.

Look for a loose 12 volt connection to the furnace itself or to the thermostat. Try turning on the water heater or stove burners to get any air bubbles out of the propane lines. Make sure you're not low on propane. Poor house batteries/corroded connections can cause problems with furnace and appliance controls. Get a voltmeter and monitor condition of house batteries and charging from the converter charger.