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Old 10-11-2016, 01:49 PM   #1
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furnace pushes cool air in ceiling vents

My Sunseeker 2500 TS furnace started doing something unusual. When I turn it on hot air comes our of the vents on at the floor level just as it should. But lately, cool air also comes out of the ceiling vents as well. This is counter productive and I do not know how to stop it. Any suggestions?

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Old 10-11-2016, 01:50 PM   #2
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Put your Dometic digital thermostat on "auto" instead of low or high....

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Old 10-11-2016, 02:00 PM   #3
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This is a common question asked here.
A quick search will turn up lots of prior posts on this very question.

If you have the Dometic digital thermostat, set your fan setting to AUTO.
That will keep the A/C fan from running when the furnace is on.

Many folks like this option.
Warm air rises and the A/C fan distributes that air more evenly than what the furnace alone can do.
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Old 10-12-2016, 01:57 PM   #4
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I didn't know how to do this, so in case you need a refresher, cycle your thermostat through its selections stopping on fan. Next use the + or - buttons through low, hi and then stop on auto. I believe it has this option with the furnace in case you want to use the AC (blower only) to circulate the inside air, which if I remember right, heat rises. Hope these answers help...

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Old 10-13-2016, 12:49 PM   #5
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a/c running with furnace.

Just switch the a/c breaker off.
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Old 10-13-2016, 07:37 PM   #6
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I remember the first time I turned the heat on and I thought the air was on too LOL. For sure the paperwork I had did not mention anything like this. But after some search on the internet I found out what was going on. I wish the wife would have taken a picture of the face I was making when it first happened. That would have been for a good laugh now.

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Old 10-13-2016, 10:00 PM   #7
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Papakilo did you set your fan to auto and try it out?

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furnace, vent

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