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Old 05-06-2013, 05:27 PM   #1
chartrand
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AC Fan Runs when Furnace is on

Is it normal for the AC fan to run when Furnace is running. I understand the logic of moving the air around the cabin, but the air comes out at a pretty high velocity and it feels cool. I saw another post on this but I'm unable to find it to see what the answer was. I think It was hidden in another post.
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Old 05-06-2013, 05:45 PM   #2
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Check to see if your thermostat is set to auto. This should solve your problem.
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Old 05-06-2013, 06:47 PM   #3
chartrand
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Thermostat just has 3 modes, fan, cool and heat, no auto. I put it on heat, set my temp and the furnace goes on and off as heat is needed (expected behavior), but the AC fan runs the entire time.
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Old 05-06-2013, 07:04 PM   #4
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Press mode to get fan led on, in LCD display, you will see either Lo, Hi or Au(auto) -- press +/- to get Au showing.
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Old 05-09-2013, 05:35 PM   #5
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With regards to your thermostat, I had a salesman/manager show me how to reset the system if both AC and furnace fans came on together.

Cycle thermostat to off (no display), press and hold the + button first and without releasing it press the on/off button and hold. After a few seconds the display will indicate --. Release both buttons and then press the on/off button to turn off the system. In the thermostat manual this is called the 'System Initialization' which should have been performed by the installer.

Hope this helps.
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Old 05-10-2013, 06:18 PM   #6
chartrand
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Yep fan to auto took care of it, thanks guys...
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Old 05-12-2013, 07:26 AM   #7
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Quote:
Originally Posted by B&T View Post
Press mode to get fan led on, in LCD display, you will see either Lo, Hi or Au(auto) -- press +/- to get Au showing.
The fan was coming on for me every time we would put the heat on this past winter. I turned the A/C breaker off, don't laugh, it worked.

Thank You, I just went out and checked and my fan was on high, put it on auto. Thanks again!
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Old 01-30-2022, 07:07 PM   #8
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Keystone heat system Fan and Heat on same time

If your heat/furnace is on, at the thermostat with green light indicator, and the central ceiling air/fan is on and blowing cool air through your ceiling vents then you must cycle the on/off button back to fan mode and the press the +or - buttons. You will see the Lo, Hi, and Au. You must at the fan mode to Au.
Then press mode button until you select furnace with the green indicator lite.
This will stop the fan/ac cool air from blowing through the ceiling vents and running constantly.
This will leave just the heat to rise up from the floor vents.
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