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Old 01-18-2014, 10:53 AM   #31
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My air conditioner runs when you run the furnace. I went and turned off the breaker for the a/c to stop it from running. What is the fix you use??

PhotoMaster, took your advice and trip the AC breaker and just the furnace ran. Hopefully not screwing something up. Here's a photo from this last week of camping. Had a good time...

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Old 01-18-2014, 11:48 AM   #32
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Rolling Magic, I believe I had the same problem which I understand common to FR3 setting at factory. Try setting the thermostat to fan. Place the setting on auto. Turn up the heat. The lower furnace (LPG) should turn on without the upper ac unit. Give that a try and see if that will work. Good luck. David
It took me a few minutes to figure out what you were saying, but it works perfectly now!

Also, if you shut off the breaker to the A/C you won't hurt anything because it's just like dry docking.
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Old 01-18-2014, 02:54 PM   #33
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Wow, I rarely use my furnace because of this exact problem. It's so noisy, and I always wondered why there was cool air blowing from the top.

I read two fixes here: one to trip the breaker to the A/C, and the other to set it on fan instead of furnace, set to auto, then turn up heat... but I don't know how to turn up the heat once I have it set on auto. The + and - buttons just cycle through hi, lo, and au.

Anyway, it looks like either way there is a fix. I, too, have primarily been using electric heaters due to the noisy furnace. They work okay, but my electric bill at the park ends up being pretty high.

So glad I found this thread.

Barbara
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Old 01-18-2014, 03:03 PM   #34
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Wow, I rarely use my furnace because of this exact problem. It's so noisy, and I always wondered why there was cool air blowing from the top.

I read two fixes here: one to trip the breaker to the A/C, and the other to set it on fan instead of furnace, set to auto, then turn up heat... but I don't know how to turn up the heat once I have it set on auto. The + and - buttons just cycle through hi, lo, and au.

Anyway, it looks like either way there is a fix. I, too, have primarily been using electric heaters due to the noisy furnace. They work okay, but my electric bill at the park ends up being pretty high.

So glad I found this thread.

Barbara

It does make a difference...
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Old 01-18-2014, 04:09 PM   #35
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I read two fixes here: one to trip the breaker to the A/C, and the other to set it on fan instead of furnace, set to auto, then turn up heat... but I don't know how to turn up the heat once I have it set on auto. The + and - buttons just cycle through hi, lo, and au.
Using the +/- buttons, set it to AU.
Then use the mode button to go to furnace. Then the +/- buttons will adjust the temperature.
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Old 01-19-2014, 09:17 AM   #36
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Dometic Thermostat Operator's Manual

Thanks. It worked. Last night I used the furnace for heating instead of electric. While I can definitely hear it, it's not so loud as to disturb me, unlike when the A/C fan was on as well. Don't know what I'll do when the day comes I need to use A/C.

I went online and found the operator's manual for the thermostat. What hadn't been clear to me is that 'fan' applies strictly to the A/C fan, and, contrary to what you'd think, "Au" turns off the A/C fan.

I'm uploading the manual here.

Barbara
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File Type: pdf DometicThermostat.pdf (1.39 MB, 57 views)
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Old 01-19-2014, 11:38 AM   #37
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Thanks. It worked. Last night I used the furnace for heating instead of electric. While I can definitely hear it, it's not so loud as to disturb me, unlike when the A/C fan was on as well. Don't know what I'll do when the day comes I need to use A/C.

I went online and found the operator's manual for the thermostat. What hadn't been clear to me is that 'fan' applies strictly to the A/C fan, and, contrary to what you'd think, "Au" turns off the A/C fan.

I'm uploading the manual here.

Barbara
In auto it should turn on when the A/C is needed.
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Old 01-19-2014, 04:24 PM   #38
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You're right, of course. The fan is off if you're in Auto when the furnace is on, but will cycle as needed when A/C is on. I hadn't thought about that.

B
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Old 01-21-2014, 10:48 AM   #39
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furnace/thermostat?

Okay, after several blissful mornings of being able to wake up to a warm rig, this morning it was quite chilly. I checked the thermostat: furnace on, set to 70, temperature was at 58. I pushed the thermostat setting up a couple of degrees and the furnace went on for about 30 seconds.

So... I'm thinking it's a thermostat problem, not a furnace problem. That said, does anyone have experience with replacing the Dometic themostat? I don't see how it comes off the wall (do I just pull?), and am not sure how big of a deal it is to replace.

Any thoughts would be appreciated.

BG
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Old 01-21-2014, 08:42 PM   #40
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I know this will sound dumb but, I say this from personal experience, how is your propane holding out?
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