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These newer furnaces start a ventilating fan to exhaust any gas that may have accumulated before they actually open the gas valve and try igniting. If it does not actually ignite, it could be because of a stuck or faulty air flow switch by your blower. Find your furnace model and serial number then do a search on internet for wiring diagram. From that you should be able to tell all the things that have to go right for the furnace to run right and actually heat your 'home'. When my RV furnace failed to ignite, I found that the problem was a stuck gas valve that just needed a gentle tap. Of course this was after hours of trouble shooting.
Could be thermostat or safety switch(es) in the furnace. Are you sure that the pilot is staying lit? Are you sure the main burner is lighting? Are you sure the forced draft blower is running, and the blower-detection "flapper" switch is working OK? Any of these safety devices will cause the gas supply valve to close if they are not "satisfied" in a few seconds after the thermostat calls for heat. They keep your RV safe!
One way to locate the water pump is to turn on a facet and then turn on the water pump. You should be able to hear it run as it tries to "catch up" on water flow/pressure. Look where the sound comes from. You can find the water heater from outside the RV by looking at the walls for a access door that has a screen on a portion of it. This will be the location of either the water pump or the furnace. If furnace, look for another such door.
The AC typically uses the same blower as the heater to circulate the cool air. Sounds like it is working properly just turn it to cool rather than heat.
If it runs then there several things that could be wrong with it. one there might be something blocking the air flow which won't let it ignite usually mud dabbers like to build nest in furnace vents and intakes look in the vent with a light and see if this is the cause.
Is the pilot light lit? There should be a valve that turns the gas off at the furnace itself. This valve is for the pilot lite There is no breaker of sorts but rather a sparker that lights the furnace. If the furnace does not light there is a small 12 volt valve that shuts off the gas to the furnace but not to the pilot light. Also make sure your 12 volt system is connected and operating. It wont work without it as it operates off that system not 120V. The same goes for refrigerators, the will not function with the 12v system disconnected
Go to your thermostat and access the fan mode. Change the fan mode to Automatic, AU. This will stop the AC fan from blowing when the furnace is turned on. If the fan mode is on Hi or Lo and the furnace is turned on it will turn on the AC blower. Bad design...
Most likely:
The blower fan, commonly called a 'squirrel cage" probably came loose and is hitting the housing. Furnace must be removed to re-align and tighten the allen screw. The motors themselves are very reliable and last years.
If you didn't cover the inlet/outlet exhaust with a screen when in storage you may have wasp nests. I forgot once and removed 4 paper nests and 2 mud dauber ones. Had to disassemble the whole furnace!
Go to the thermostat and access the fan mode. Change the mode to AU (automatic) then turn the furnace on and it should work normally. If the fan mode is in Hi or Lo the Ac fan will blow.
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