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Old 05-24-2016, 04:03 PM   #1
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Furnace problem

I have a 2012 jayflight 32tsbh. Whenever I turn the propane on the furnace comes on and won't shut off. Doesn't matter if the thermostat is on or off or what the temp is set to. Any help would be great
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Old 05-24-2016, 04:17 PM   #2
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Welcome to the forum.

Sounds like it might be a thermostat problem. If you carefully remove the thermostat and then turn on the propane, you'd know if the thermostat was causing the problem.
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Old 05-24-2016, 04:20 PM   #3
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The thermostat runs the air fine so I didn't think it would be a thermostat problem. But I'll try the next time I'm in it
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Old 05-25-2016, 12:04 AM   #4
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Different wires from the thermostat controls the furnace and the air. It sounds like you have a short in the system which is always applying 12v to the furnace relay. With a volt meter check to see if you have a constant 12v signal to the furnace while turning the thermostat heat on and off. If this is the case then you need to locate the short.
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Old 05-25-2016, 07:11 AM   #5
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Along the shorted circuit theory...


Check the connections at the furnace. Bare wires under screws are a short circuit waiting to happen! There should be 2 or 3 separate wires.
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Old 05-25-2016, 10:14 AM   #6
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Quote:
Originally Posted by rustysheros View Post
I have a 2012 jayflight 32tsbh. Whenever I turn the propane on the furnace comes on and won't shut off. Doesn't matter if the thermostat is on or off or what the temp is set to. Any help would be great
Regardless of any problems in the thermostat, I can't figure out how turning the propane valve on causes the furnace to come on. Can some one explain how that can happen?
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Old 05-25-2016, 02:50 PM   #7
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Quote:
Originally Posted by Hohenwald48 View Post
Regardless of any problems in the thermostat, I can't figure out how turning the propane valve on causes the furnace to come on. Can some one explain how that can happen?
I agree with you. I just don't see how that could be possible. Maybe in an alternate universe...
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Old 05-25-2016, 05:52 PM   #8
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The furnace needs two things fuel and a signal calling for heat to turn on (the same circuit that is shorted. See, this universe.
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Old 05-25-2016, 06:47 PM   #9
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The OP stated that when he/she turns on the propane the furnace comes on. Now I've turned my propane off and on thousands of times on a dozen or more RVs and never once did the furnace come on when I turned on the valve.

Of course there needs to be propane at the furnace for it to operate but that's not what the OP said. I'm just trying to get some clarification as I don't see any connection between the tank valve and the furnace thermostat. Not in any universe.
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Old 05-25-2016, 07:19 PM   #10
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The control valve for the propane line to the burner has to see constant pressure from the supply tank before it will allow the valve to open, remain open, or continue to supply gas to the burner(s). If not, it likely won't allow the blower to start either. If you turn off the tank outlet valve, pressure eventually bleeds down, and the control valve shuts off. Turn it back on again, with the theoretical short circuit showing a demand to start, and it will start up again. That's why a short circuit will cause this, just as if you had turned on the thermostat and set the temp high enough to turn the system on.
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