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Only blows cold air David 11-24-15  
My propane tanks are full, furnace engages when it hits the set point on thermostat, but just blows cold air.
Re: Only blows cold air Keith 11-24-15  
Hi David, the first thing to check before you start changing parts is the circuit board. It can be tested at any RV shop, usually for free. If it's ok then go from there. Continuity check the sail switch, limit switch etc. Since you didn't specify the make and model..... if it's an Atwood/Hydro Flame with an outside access door the board can be removed easily, Suburban fairly easy. If it's a Suburban or Atwood with no access door you'll have to remove the furnace. In that case you might as well take the whole furnace to the shop and have it checked out. Good luck
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