Why is our furnace be blowing cold air when thrm is set to heat?

myclementineOctober 26, 2008

We woke this morning to cold air coming out of the vents. What could the problem be?

No body has touched anything out there. I am not sure how to check the condensation to see if it is full or plugged.

Any suggestions? Of course it is Sun. so I will have to wait until tomorrow to call the heating guys.


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Well, we turned the thermestat off for a while and changed the filters then turned the therm back on and voila, hot air! So what really happened? Why would it do that? I just don't understand.

    Bookmark   October 26, 2008 at 2:28PM
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It is very possible that your filters were dirty and/or restrictive, thus reducing air flow. When this happens, temperature inside the furnace may rise to an unsafe level.

Then, the burner turns off and the fan runs to cool everything down. This is a safety feature.

What type of filters are you using and where are they located? Some pleated filters (Filtrete, 3M)can be restrictive.


    Bookmark   October 26, 2008 at 3:08PM
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I bet that is what happened. DH hates changing those filters even though DS and I have bad allergies. We have 1 filter headed up the stairs to the bonus room and one in the great room/living area.
How often are filters to be changed? I am thinking it would be a good Christmas gift for DH :)

    Bookmark   October 26, 2008 at 3:30PM
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It quit working again Sunday evening so I called our local repair guys and they came Tuesday afternoon. The board was bad.

    Bookmark   October 29, 2008 at 10:45PM
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