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As it has happened to me, My money is a a defective sail switch.
RV heaters have a paddle type safety switch called a Sail Switch, that hangs down in front of the fan outlet. When you turn on the heater, the blower fan starts, the airflow causes the padddle on the Sail Switch to close a circuit which tells the gas valve that the airflow has been proven and it is safe to open the valve and ignite the gas.
Simple fix but I think it will requre pulling the heater in order to get to the switch
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Kayo Full timer since 2003
2014 Prime Time Sanibel 3501. 2013 Silverado 3500HD diesel dually. Seasonal NPS Park Ranger USMC 0302
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