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Old 09-07-2019, 10:43 AM   #1
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Ghostly Furnace

Well havenít been in MH ( 02 36S Bounder) for week and when near it today both furnace blowers were on. Checked thermostat it was off. Had to shut it off with the salesman switch. Any ideas as it kicked back on with the switch still off. Turned the thermostat down as low as it would go and hasnít kicked back on yet! I believe they are Atwood furnaces.
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Old 09-07-2019, 11:13 AM   #2
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We need some more info. Brand of furnace.
Is it on a separate thermostat.
Brand of thermostat,
Is it on the same thermostat as the A/C unit(s)?

To keep the furnace shut of for now, pull the 12 volt fuse that feeds the furnace.

Ken
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Old 09-07-2019, 11:24 AM   #3
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Ghostly Furnace

They are Atwood furnaces [ATTACH]259490
Here is pic of thermostat. And yes it controls both ac and furnaces. It was on just a second ago and shut off on its own..
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Old 09-07-2019, 11:26 AM   #4
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Ghostly Furnace

It has never done this in the past
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Old 09-07-2019, 11:58 AM   #5
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Is the furnace heating the air when the fan is running? Or is it cooling?

Switches for Heating and Cooling both off? Or which mode is currently On?

I didn't see it in the picture but is there a Fan Control switch that allows On/ Auto? Is it set to Auto?

I assume it is set to Heating Mode since the furnace fan is on. Start by turning the furnace temperature setpoint to a temperature way below (-5 degrees) the current temperature in the coach and verify the fan turns off and stays off.

Fan stays on? I would guess it's a control board issue, i.e. bad board, loose wire connection either at the tstat board or at the furnace fan,etc.

Fan goes off? Raise the setpoint up 1 degree and wait at least 5 minutes to see if/when the furnace / fan starts up. Note the cycling temperatures if it does cycle.
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Old 09-07-2019, 12:02 PM   #6
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Ghostly Furnace

It is completely off hard to see in pic. Itís just blowing cool air thru floor ducts doesnít seem to be calling for heat just running on its own out of the wild blue. PS it hasnít been used for heat in a year did run AC couple weeks ago. When I first noticed it both front and rear were on, just before I posted pic it was just front fan blowing. Still thermostat in off positions
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Old 09-07-2019, 01:11 PM   #7
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When the fan is running, is it Low or High Speed? If it's low, maybe the switch is in the low speed position, though it does not explain the cycling unless it is partway in between Off and Low Fan and vibration or something causes it to go off/ low fan without any heat.

Are the switch positions on the tstat nice and crisp when moved or are they not very distinct? If they are a little sloppy, that might be causing the cycling. The tstat in my rig is very sloppy and hard to set it exactly where I want it.
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Old 09-07-2019, 03:38 PM   #8
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In your photo, both furnaces are on.
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Old 09-07-2019, 03:55 PM   #9
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A poor resolution photo in Post #3

Quote:
Originally Posted by Waiter21 View Post
In your photo, both furnaces are on.
After blowing up the attachment, it looks like they are both off.
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Old 09-07-2019, 06:51 PM   #10
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Yes, It looks like they are both OFF..
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Old 09-08-2019, 09:30 AM   #11
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Very distinct in every position
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Old 09-08-2019, 01:01 PM   #12
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Pulled the ECC fuse waited 10 minutes then plugged back in and about a minute or so fan back on for a minute then shut off. It is still coming on by itself and shutting down so pulled the fuse until itís figured out
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Old 09-08-2019, 01:02 PM   #13
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Have you had heavy rains in your area? Mine would do all kinds of silly things (when OFF), after a heavy rain-blower would blow, fortunately no heat would be produced. I ended up taking the inside "return air" thingy off and unplugging it in order for it to stop. I took the outside cover off and found water intrusion, and the "mother board" was wet. After drying thoroughly and weather stripping the indentations on the cover's gasket. No more issue. Hope this might help.
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Old 09-08-2019, 10:34 PM   #14
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I will give it a shot but didnít see anything like water intrusion and we have had a bit of rain here in SW Michigan. I did try unplugging the wire harness on the motherboard and the fan would stop but when plugged back in it would start again run for couple minutes or so then shut off again just kept doing it so for now have the aux switch off until I figure this out. When fan was running pulled the ECC fuse fan still ran so have to find the furnace fuse. Maybe itís in the engine compartment
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