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04-24-2016, 07:32 PM
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#1
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Senior Member
Join Date: Jan 2016
Location: Outside StL
Posts: 208
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Furnace and A/C running at the same time.
I have a 2016 Coachmen Chaparral I bought in January. It's my 4th trailer.
Just returned from our 4th camping trip this year. We used the furnace all the trips. This weekend when I put the thermostat (Dometic digital) on "Heat", it turned on the furnace AND the A/C. I had to throw the breaker for the A/C to get just the furnace to run. During the day, it got hot so I switched the thermostat to "Cool" and the A/C worked fine. (after I flipped the breaker back on)
Pretty sure it's the thermostat, but I'm hoping this is a common issue with an easy fix. My dealer is 2 1/2 hours away.
j
__________________
2016 Coachmen Chaparral 390QSMB
2011 F350- CC, DRW, LB, PSD
2016 nights camped: 40
2017 nights camped: 16
2017 nights reserved: 30
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04-24-2016, 07:37 PM
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#2
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Site Team
Join Date: Mar 2008
Location: Southwest Alabama
Posts: 9,850
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If the fan on the t-stat is set to Lo or Hi it will run whenever the furnace runs. Crazy, I know, but that's how they work. Set the fan to Auto and it won't run when the furnace is on.
__________________
Salem 29RKSS Pushing a GMC Sierra 2500HD!
Gotta go campin! 
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04-24-2016, 07:43 PM
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#3
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Senior Member
Join Date: Jan 2016
Location: Outside StL
Posts: 208
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Quote:
Originally Posted by Bama Rambler
If the fan on the t-stat is set to Lo or Hi it will run whenever the furnace runs. Crazy, I know, but that's how they work. Set the fan to Auto and it won't run when the furnace is on.
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A Google search after I posted turned up the same thing and a post on here from 2013 saying the same. Here
Apparently DW said she was "playing" with it the day before. Now I have to figure out how to put it back on Auto since it doesn't make it very obvious.
j
__________________
2016 Coachmen Chaparral 390QSMB
2011 F350- CC, DRW, LB, PSD
2016 nights camped: 40
2017 nights camped: 16
2017 nights reserved: 30
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04-24-2016, 07:50 PM
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#4
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Site Team
Join Date: Mar 2014
Location: Grayson County, Texas
Posts: 21,551
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Set the thermostat mode to FAN then use + or - to cycle through HI, LO, AU
__________________
2015 FR Wildcat 295RSX / GMC Sierra
Nights Camped: '13 = 49/'14 = 74/'15 = 74/'16 = 85/'17 = 110/'18 = 111/'19 = 86/'20 =108/'21 = 115/'22 = 135/'23 = 78; Booked for 2024 = 69 |
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04-25-2016, 03:31 PM
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#5
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Senior Member
Join Date: Dec 2014
Location: SD
Posts: 172
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Quote:
Originally Posted by VizJedi
I have a 2016 Coachmen Chaparral I bought in January. It's my 4th trailer.
Just returned from our 4th camping trip this year. We used the furnace all the trips. This weekend when I put the thermostat (Dometic digital) on "Heat", it turned on the furnace AND the A/C. I had to throw the breaker for the A/C to get just the furnace to run. During the day, it got hot so I switched the thermostat to "Cool" and the A/C worked fine. (after I flipped the breaker back on)
Pretty sure it's the thermostat, but I'm hoping this is a common issue with an easy fix. My dealer is 2 1/2 hours away.
j
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The easy fix is to make sure the fan is on Auto that sollves the problem 
__________________
2006 Gmc
2016 Forestriver Sierra 376 BHOK
Full Timers
Dick, 
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04-25-2016, 03:54 PM
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#6
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Senior Member
Join Date: Nov 2013
Location: Denver, CO
Posts: 154
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Yup. I was dying trying to figure this one out. As others have said, set the fan to auto. Problem solved.
__________________
TV: 2018 Ford F-350 Powerstroke
Trailer: 2013 Palomino Puma 27SBU
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04-26-2016, 07:59 AM
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#7
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Team Bleu
Join Date: Aug 2013
Posts: 99
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We turn the fan on Auto and then I turn the AC to 55 and heat up to 70 when using in the winter, then I reverse it heat down to 55 and AC up to 70. Crazy how those dials works
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04-26-2016, 07:42 PM
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#8
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Senior Member
Join Date: Apr 2016
Posts: 600
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nice tip to remember, wife set ours to C and she read the book and -+ @ same time back to F
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04-26-2016, 07:59 PM
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#9
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Site Team
Join Date: Oct 2014
Posts: 15,282
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Just in case.
__________________
2015 Freedom Express 248RBS
TV 2015 Silverado HD2500 Duramax
TST Tire Monitors
Honda 2000I + Companion
2 100W solar panels
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04-27-2016, 08:17 PM
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#10
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Senior Member
Join Date: Jan 2016
Location: Outside StL
Posts: 208
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Quote:
Originally Posted by Flybob
Just in case.
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Thanks FlyBob,
I found one and read through it, but didn't save the pdf. I have this one now. It made sense when I read it, but 3 weeks from now when we are heading out again... What did they say about the first thing you lose?
j
__________________
2016 Coachmen Chaparral 390QSMB
2011 F350- CC, DRW, LB, PSD
2016 nights camped: 40
2017 nights camped: 16
2017 nights reserved: 30
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05-14-2016, 07:09 AM
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#11
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Junior Member
Join Date: Jul 2015
Location: Lanesville, IN
Posts: 8
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I can find out practically anything I need in this forum - it's awesome! My fan was on low, not auto! Thanks so much!
2nd Season Camper
Still a LOT to Learn!
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