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07-28-2015, 06:07 PM
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#1
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Senior Member
Join Date: Mar 2015
Location: Utah
Posts: 642
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Furnace and A/C running at same time
Just tried our furnace for the first time, and when it came on the A/C came on at the same time. Only happens when on shore power or generator running. Any ideas? We think maybe thermostat wired incorrectly.
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1968 tent trailer
1985 Jamboree 23 ft
1997 Minnie Winnie 25 Ft
2016 Forester 3171DS (ordered March & arrived June 2015)
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07-28-2015, 06:45 PM
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#2
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2012 Solera
Join Date: May 2012
Posts: 1,824
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Several threads on this. Most likely the aircon compressor isn't running - just the fan. Circulates the air (heat). If you prefer the fan in the air conditioner off when using the furnace, as most of us do, go to the thermostat, select "fan", use the "+" and "-" buttons to select "Auto", then re-select heat. With the fan set to auto, it will stay off when the furnace is used and will cycle with the compressor when the aircon is used.
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JLeising
2012 Solera "S"
Calif SF Bay Area
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07-28-2015, 06:56 PM
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#3
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Senior Member
Join Date: Mar 2015
Location: Utah
Posts: 642
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Quote:
Originally Posted by JLeising
Several threads on this. Most likely the aircon compressor isn't running - just the fan. Circulates the air (heat). If you prefer the fan in the air conditioner off when using the furnace, as most of us do, go to the thermostat, select "fan", use the "+" and "-" buttons to select "Auto", then re-select heat. With the fan set to auto, it will stay off when the furnace is used and will cycle with the compressor when the aircon is used.
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Thx Jleising, we will give that a try.
__________________
1968 tent trailer
1985 Jamboree 23 ft
1997 Minnie Winnie 25 Ft
2016 Forester 3171DS (ordered March & arrived June 2015)
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07-29-2015, 04:46 PM
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#4
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Senior Member
Join Date: Jul 2013
Location: Baton Rouge
Posts: 497
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Quote:
Originally Posted by JLeising
Several threads on this. Most likely the aircon compressor isn't running - just the fan. Circulates the air (heat). If you prefer the fan in the air conditioner off when using the furnace, as most of us do, go to the thermostat, select "fan", use the "+" and "-" buttons to select "Auto", then re-select heat. With the fan set to auto, it will stay off when the furnace is used and will cycle with the compressor when the aircon is used.
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I can confirm. Yes, just the fan from the ceiling A/C is running to help circulate the air. I rarely use our furnace - preferring the heat pump for most heating needs so I have not tried the option of selecting the A/C fan OFF when on furnace.
Bobby
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07-29-2015, 04:56 PM
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#5
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Senior Member
Join Date: Sep 2013
Location: Idaho
Posts: 9,839
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Never mind....
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2016 F350 6.7L LB CC Reese 28K 2014 Chaparral Lite 266sab
"Those who would give up essential Liberty, to purchase a little temporary Safety, deserve neither Liberty nor Safety." 2014 19 days camping 2015 17 days camping201620 days camping
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07-30-2015, 11:44 AM
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#6
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Senior Member
Join Date: Sep 2014
Location: Knoxville
Posts: 228
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bgilly:
When using the Heat Pump, does it run on electric, not Propane?
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2015 Forester MBS 2401R
No Toad
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07-30-2015, 12:07 PM
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#7
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Senior Member
Join Date: Jul 2013
Location: Baton Rouge
Posts: 497
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Quote:
Originally Posted by FIVE2MH
bgilly:
When using the Heat Pump, does it run on electric, not Propane?
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Right, electric only. It reverses the cycle of the air conditioner to heat the air inside rather than cool it. Works good for heat down to around 38 - 40 degrees outside air temp..
Bobby
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07-30-2015, 01:42 PM
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#8
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Senior Member
Join Date: Dec 2009
Location: Napa Valley, CA
Posts: 513
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Some digital thermostats have a programmable fan function: choices are AU (auto), LO or HI. If you program it on LO or HI the A/C fan will come on with the furnace. If you program it on auto, the furnace will not activate the fan.
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2015 Rockwood A128S
2010 Rockwood 2604
2014 Ford F-250 CC SB 2WD
2008 Toyota Sequoia 2WD
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07-30-2015, 02:03 PM
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#9
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Senior Member
Join Date: Mar 2015
Location: Utah
Posts: 642
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Quote:
Originally Posted by Big Vic
Some digital thermostats have a programmable fan function: choices are AU (auto), LO or HI. If you program it on LO or HI the A/C fan will come on with the furnace. If you program it on auto, the furnace will not activate the fan.
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That's the exact thermostat we have. JLeising above mentioned exactly what you said. That must be the problem we had then. I had the thermo set to Lo on the fan. Will set to auto the next time we fire up the furnace. Thx for your feedback Big Vic.
__________________
1968 tent trailer
1985 Jamboree 23 ft
1997 Minnie Winnie 25 Ft
2016 Forester 3171DS (ordered March & arrived June 2015)
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07-30-2015, 02:05 PM
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#10
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Senior Member
Join Date: Sep 2014
Location: Knoxville
Posts: 228
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Thanks for confirming...��
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2015 Forester MBS 2401R
No Toad
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