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Old 04-18-2021, 06:53 AM   #1
ErickW
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Furnace won't start at all

2011 Montana, haven't looked at brand of furnace, but I suspect a Dometic.

Recently the furnace has stopped working, will not even try to kick on, don't hear any clicking. Thermostat starts the AC, so I don't think it's that (at least from what I've read on other posts)

Any thoughts on what I should check before I start looking for a replacement?
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Old 04-18-2021, 07:23 AM   #2
JRTJH
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If the furnace fan won't start, but you hear clicking in the Air Conditioner, my first check would be the fuse panel in the power center. Check the one labeled "FURNACE".
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Old 04-18-2021, 07:24 AM   #3
ErickW
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I actually just checked all the fuses, they are all good.
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Old 04-18-2021, 07:30 AM   #4
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You need to access the furnace. If it has the large rectangle cover on the outside, take it off and look for the reset switch. If it doesnt then you may have to pull the furnace from inside the coach. If you can locate the 4 wires going to the furnace I would check for 12V there. The blue are the thermostat signal so you can disregard them at the moment.
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Old 04-18-2021, 08:16 AM   #5
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If the furnace is not working at all, not clicking, not turning on, the first question to answer is: Is it getting power?"... If the fuses are all good, then the next step, as Chuck posted is to go to the "furnace connection on the unit" and verify whether or not there is 12 VDC at the furnace (and while there, push the reset button). Next, if that is "all good" is to start "digging into the furnace control system, part of which is in the air conditioner (on the roof) as well as the thermostat....

But, typically, if the controls are functional, you'll get some "clicking or a fan running" in the furnace.... With all that "missing", I'd tend to focus on input power to the unit.
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Old 06-17-2021, 07:39 AM   #6
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Did you ever resolve this? I’m having the same issue. I only hear one click in the AC unit when I switch to furnace on my thermostat. Then nothing happens. I just had the control board replaced on my thermostat so I know that is good. Question: The reset switch. There is a reset position and an off position. Should the switch be in between those two? I’m not home right so I’ll have to check this later.
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