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Old 10-20-2012, 10:16 PM   #1
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Heater / furnace 350xl

Why would the AC units come when I run the furnace? Did not do this yesterday.
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Old 10-20-2012, 11:24 PM   #2
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Ours started doing the same thing (just the front unit) the last time our dealer worked on the front heat strip.

We were in the mountains early last spring so I had to flip the front AC breaker.

We’re waiting till it cools of a little more, then maybe they’ll be able to fix both.
3rd attempt for the heat strip, but they’re probably hard to work on when it’s over a hundred*.

ab and jb
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Old 10-21-2012, 12:08 PM   #3
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So what is causing the AC to go on when the heartier is on and selected?
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Old 10-21-2012, 02:32 PM   #4
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Quote:
Originally Posted by SemperFi3088
Why would the AC units come when I run the furnace? Did not do this yesterday.
In fan auto setting, helps circ the heated air?
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Old 10-21-2012, 03:18 PM   #5
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On the thermostat the fan has to be set on automatic or the AC fan will come on.
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Old 10-21-2012, 03:30 PM   #6
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On the thermostat the fan has to be set on automatic or the AC fan will come on.
X2
Yes if the fan needs to be set to AUTO.
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Old 10-21-2012, 03:55 PM   #7
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Thanks. I will check out. Appreciate this forum and all that contribute. Looking forward to the day when I'm not a "taker"
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Old 10-21-2012, 04:39 PM   #8
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Glad to help. Then it makes it easier to ask for help when I need it. And I have been helped a number of times on this forum.
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Old 10-22-2012, 09:43 AM   #9
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Does GT use crappy thermostats? I can't seem to keep the furnace on and regulated unless the thermostat is set to 71. On way home from Nashville it got down to 31 overnight and woke up to a freezing coach. At 60 the furnace kicked on then shut off after 20 seconds. Could not get it to fire back up so had to start the engine and run the dash heat (now that's efficient). Same thing happened just this past weekend, but this time it would operate at 71 and above.
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Old 10-22-2012, 08:11 PM   #10
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Are you sure you don't have a carbon monoxide leak and the detector is shutting off the gas? When you say it "fires up" is that the ignition or the fan that is starting? You should hear the fan start first and then the gas should light a little later. Also, only the front thermostat (not the rear) controls the furnace in the 350. If you're adjusting the rear thermostat you'll get nowhere.
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Old 10-23-2012, 08:44 AM   #11
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Trempert, only used the front thermostat on the wall, street side against the fridge above the sink. Yes the fan comes on first before the furnace ignites and blows warm air. If I had a carbon monoxide leak it would not operate at the higher settings of 71 and above.
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Old 10-23-2012, 05:06 PM   #12
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Switching fan to Auto mode fixed it. Have to remind my brother to keep his fingers to himself
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Old 10-23-2012, 09:05 PM   #13
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A few years ago on our first outing with our MH we had gas detector issues. After one cold night, I toggled the switch on the gas detector and we finally got heat. Since, I always carry a couple of ceramic space heaters as back ups.
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Old 10-24-2012, 07:29 AM   #14
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Went on line and got the Dometic thermostat manual for model 3313192. Of course GT does not provide one with coach. I re-initialized the thermostat as stated in the manual and with the rig sitting in the drive way it seems to work fine. I'll wait to a real cold night and sit in the Moho and see if it cycles. Also, reading the manual I did not know myself about the fan settings between auto, hi and low which will also activate the AC units fan for increased circulation of air.
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Old 10-24-2012, 09:52 AM   #15
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Quote:
Originally Posted by sherman12 View Post
Went on line and got the Dometic thermostat manual for model 3313192. Of course GT does not provide one with coach. I re-initialized the thermostat as stated in the manual and with the rig sitting in the drive way it seems to work fine. I'll wait to a real cold night and sit in the Moho and see if it cycles. Also, reading the manual I did not know myself about the fan settings between auto, hi and low which will also activate the AC units fan for increased circulation of air.
Sherman could you give us your link.
I’ve been searching the Dometic web and the only things I can find for the “Single Zone LCD Thermostat” are these.

http://www.dometic.com/enus/Americas/USA/RV-Products/climate/ac-display-page/?productdataid=97074

http://www.dometic.com/75ba5bd6-30af-405e-ac27-b057ade5d705.fodoc

jb and I have the 3313189.049 Cool/Furnace/Heat Strip – White

I’ve been to the Operation & Installation Manuals section???

Thanks
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Old 10-24-2012, 02:18 PM   #16
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abjb, this is the pdf link for the Dometic thermostat wwww.primetimerv.com/.../Thermostat-SingleZoneDigital-Dometic-hich does cover units with heat pumps and heat strips
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