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09-26-2014, 05:21 AM
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#1
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Established Member
Join Date: Dec 2013
Location: Tucson
Posts: 20
M.O.C. #13927
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A/C and Furnace on at the same time
Got up this morning after a long overnight thunderstorm and it was a little cool inside. Turned on furnace and both A/C and furnace came on, but furnace never fired up. How do I get the A/C to not come on? Do I need to re initialize the thermostat? Turned on fireplace and took chill off. DW and G Ret are happy now, but want to be ready for tomorrow. Thermostat was set at 66 degrees. Outside temp was 40.
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09-26-2014, 05:52 AM
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#2
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Montana Fan
Join Date: Feb 2011
Location: Broken Arrow
Posts: 393
M.O.C. #11127
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if you have the dual zone thermostat controls i believe you have to go to zone 1 and turn off a/c and zone 2 and make sure a/c is off then go back to zone 1 and scroll and select furnace and see if that will work
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09-26-2014, 06:03 AM
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#3
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Montana Fan
Join Date: Mar 2011
Location: BEND
Posts: 350
M.O.C. #11243
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I had the same issue. I had to look in the manual and follow the reset procedure. That cleared everything and then it worked fine. Sorry I don't have the manual with me to tell you how, but it was simple.
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09-26-2014, 08:13 AM
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#4
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,706
M.O.C. #12947
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On zone 1, you must change the fan setting to 'Auto'.
__________________
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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09-26-2014, 08:16 AM
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#5
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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The dual zone thermostats can be tricky without the manual.
__________________
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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09-26-2014, 08:31 AM
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#6
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Established Member
Join Date: Dec 2013
Location: Tucson
Posts: 20
M.O.C. #13927
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I am assuming that I only have a one zone as the front A/C is not controlled by the thermostat. I have all my manuals in the trailer, but assumed it was the thermostat, not the furnace or A/C. Will do some reading and get back if I figure it out. Thanks. On vacation, have plenty of time to read today as it is raining again. A day cooped up in the Montana is better than a day at work!
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09-26-2014, 09:11 AM
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#7
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Established Member
Join Date: Dec 2013
Location: Tucson
Posts: 20
M.O.C. #13927
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Re initialized the thermostat and checked all the settings. Apparently if fan is set to Lo or High, A/C fan will circulate air without compressor coming on. If you don't want the A/C to circulate air, setting fan to auto will only allow furnace to move air in furnace mode. Our thermostat fan was set on High which caused A/C fan to run too. Also now know we have a single zone thermostat with heat strips in front A/C. Today was the first time we turned on furnace since dealer walk through. Don't get to use the furnace much here in AZ as cooling is the bigger issue! Thanks for the feedback.
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09-27-2014, 02:20 AM
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#8
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Montana Fan
Join Date: Nov 2013
Location: Fayetteville
Posts: 125
M.O.C. #13868
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Cat Craw is right. reset the thermostat and that should take care of that problem. Happened to me last week. Just look at the manual.
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