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Old 07-28-2015, 06:07 PM   #1
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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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Old 07-28-2015, 06:45 PM   #2
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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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Old 07-28-2015, 06:56 PM   #3
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Originally Posted by JLeising View Post
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.
Thx Jleising, we will give that a try.
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Old 07-29-2015, 04:46 PM   #4
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Quote:
Originally Posted by JLeising View Post
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.
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.

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Old 07-29-2015, 04:56 PM   #5
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Never mind....
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Old 07-30-2015, 11:44 AM   #6
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bgilly:
When using the Heat Pump, does it run on electric, not Propane?
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Old 07-30-2015, 12:07 PM   #7
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bgilly:
When using the Heat Pump, does it run on electric, not Propane?
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..

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Old 07-30-2015, 01:42 PM   #8
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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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Old 07-30-2015, 02:03 PM   #9
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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.
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.
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Old 07-30-2015, 02:05 PM   #10
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Thanks for confirming...��
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