furnace blowing all the heat up the chimney

Posted by on November 5, 2009, 8:52 am

On Nov 4, 6:33=A0pm, "Stormin Mormon"

> Of course, that's totally possible. Bad fan limit switch.
> I've seen that before.
> --
> Christopher A. Young
> Learn more about Jesus
> =A0www.lds.org
> .
> Your stack controls are out of adjustment. The blower should
> cut off at
> 80. It should cut on at 100.

What temp the fan cuts on and off at doesn't explain how he has only
70F air coming out of the vents with the furnace fired and running
steady and why most of the house is cold.

Posted by ransley on November 5, 2009, 10:32 am

On Nov 5, 7:52=A0am, trad...@optonline.net wrote:

> On Nov 4, 6:33=A0pm, "Stormin Mormon"

> > Of course, that's totally possible. Bad fan limit switch.
> > I've seen that before.
> > --
> > Christopher A. Young
> > Learn more about Jesus
> > =A0www.lds.org
> > .
> > Your stack controls are out of adjustment. The blower should
> > cut off at
> > 80. It should cut on at 100.

> What temp the fan cuts on and off at doesn't explain how he has only
> 70F air coming out of the vents with the furnace fired and running
> steady and why most of the house is cold.- Hide quoted text -
> - Show quoted text -

It can be explained by a clogged AC coil, I saw that once at a friends
house, we just removed it for the winter and he got heat until he had
time to powerwash it. Has he or anyone even looked at his AC coil yet,
nope I bet not.

Posted by norminn@earthlink.net on November 5, 2009, 10:37 am

ransley wrote:

> On Nov 5, 7:52 am, trad...@optonline.net wrote:

>> On Nov 4, 6:33 pm, "Stormin Mormon"

>>> Of course, that's totally possible. Bad fan limit switch.
>>> I've seen that before.
>>> --
>>> Christopher A. Young
>>> Learn more about Jesus
>>> www.lds.org
>>> .
>>> Your stack controls are out of adjustment. The blower should
>>> cut off at
>>> 80. It should cut on at 100.

>> What temp the fan cuts on and off at doesn't explain how he has only
>> 70F air coming out of the vents with the furnace fired and running
>> steady and why most of the house is cold.- Hide quoted text -
>> - Show quoted text -

>
> It can be explained by a clogged AC coil, I saw that once at a friends
> house, we just removed it for the winter and he got heat until he had
> time to powerwash it. Has he or anyone even looked at his AC coil yet,
> nope I bet not.

Just for future reference, how would a clogged AC coil cause the issue?
I barely understand basics of HVAC :o)

Posted by Stormin Mormon on November 5, 2009, 11:37 am

Both the heat air and the AC air go through the AC coil. If
the AC coil is clogged, you won't get much air flow through
the furnace.

--
Christopher A. Young
Learn more about Jesus
www.lds.org
.

> It can be explained by a clogged AC coil, I saw that once
> at a friends
> house, we just removed it for the winter and he got heat
> until he had
> time to powerwash it. Has he or anyone even looked at his
> AC coil yet,
> nope I bet not.

Just for future reference, how would a clogged AC coil cause
the issue?
I barely understand basics of HVAC :o)

Posted by hr(bob) hofmann@att.net on November 5, 2009, 12:04 pm

On Nov 5, 10:37=A0am, "Stormin Mormon"

> Both the heat air and the AC air go through the AC coil. If
> the AC coil is clogged, you won't get much air flow through
> the furnace.
> --
> Christopher A. Young
> Learn more about Jesus
> =A0www.lds.org
> .

> > It can be explained by a clogged AC coil, I saw that once
> > at a friends
> > house, we just removed it for the winter and he got heat
> > until he had
> > time to powerwash it. Has he or anyone even looked at his
> > AC coil yet,
> > nope I bet not.

> Just for future reference, how would a clogged AC coil cause
> the issue?
> =A0 I barely understand basics of HVAC :o)

If the air flow is low, the over-temperature sensor may cut off the
heat whether it is gas or oil-fired, causing not enough heat. It
could also be a bad sensor, or a sensor that is set too low that is
the problem.

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furnace blowing all the heat up the chimney - Page 7