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Old 04-24-2016, 08:32 PM   #1
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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
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Old 04-24-2016, 08:37 PM   #2
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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.
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Old 04-24-2016, 08:43 PM   #3
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Quote:
Originally Posted by Bama Rambler View Post
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.
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.

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Old 04-24-2016, 08:50 PM   #4
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Set the thermostat mode to FAN then use + or - to cycle through HI, LO, AU
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Old 04-25-2016, 04:31 PM   #5
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Quote:
Originally Posted by VizJedi View Post
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
The easy fix is to make sure the fan is on Auto that sollves the problem
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Old 04-25-2016, 04:54 PM   #6
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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.
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Old 04-26-2016, 08:59 AM   #7
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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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Old 04-26-2016, 08:42 PM   #8
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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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Old 04-26-2016, 08:59 PM   #9
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Just in case.
Attached Files
File Type: pdf Dometic Thermosat.pdf (1.40 MB, 48 views)
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Old 04-27-2016, 09:17 PM   #10
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Quote:
Originally Posted by Flybob View Post
Just in case.
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
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