Furnace not working correctly

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errolcw

Member
Joined
Sep 13, 2005
Posts
15
Help!! I am getting ready to leave on a long trip and am having furnace problems.? The blower comes on, then you can hear the propane ignite but the furnace doesn't stay on.? I've checked the propane level, and the batteries and the fuses.? Any ideas?
Thanks,
errolcw
 
errolcw,
Give us a little more info on the type of RV, make of furnace, etc. If the fan runs, the ignition sequence starts and then main flame goes out, the likely cause is failure of the flame detector or a circuit board failure. Those are things that are getting into the realm of "Service Tech Required". Here are some things to eliminate from the list of possibilities.
Have you done the routine things like light a burner on the stove. That will tell you if there is propane available to the furnace. Make sure all the vents and returns are open and clear. Most RV furnaces have an airflow "sail" switch that will not allow the burner to operate with a reduced airflow. Most RV furnaces have no air filter. Check to see if one has been added. If so, remove it and try again. With the fan running, check to see if you can feel air flow at a duct register. A low coach battery may cause the fan to run slowly enough that the sail switch won't make.

Try those things and get back to us with more specific data and try to describe exactly what happens and when so we can get a better idea of what's going on.
Q
 
If your rig is getting on to 5 years or so - it might be time to have the propane pressure checked.  Must be about 11 inches of water.  In time the regulator gets oil in it from the propane and reduces the flow.  The flow for the furnace has to be up to spec's which is a good hefty flow.

Be sure you follow quasi's suggestions about air flow etc.  When you are checking the furnace - set the thermostat up toward the upper limit.

 
Also check to see that nothing is restricting the exhaust from the burner.  Smaller birds can get in there and build nests, which pretty well block the air flow, and mud daubers nests can cause varying degrees of blockage.
Sarah
 
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