Furnace blower not turning on when it should

Posted by ATJaguarX on February 3, 2009, 11:15 pm

I have a newer furnace (about 18 months old) in a new home (just as
old). I noticed the other day that I heard the furnace exhaust fan
go, followed by the gas starting to burn. A few minutes went by and
the blower never kicked in. After a few minutes, I checked the
thermostat. It read "Heat On", but it wasn't blowing any air. At
this point, the gas had to be burning for 5 minutes. I turned it to
"Off" and then back to "Auto". It then went through the same
routine.... exhaust on, gas on and finally followed by the blower. I
thought it was weird and figured I would keep my eye on it.

Today, I notice it was a bit cold in the house, but didn't think
anything of it. I got up and heard the gas running again, but noticed
that the furnace wasn't blowing. I checked the thermostat again.
This time, the thermostat was set to 70 degrees, but was currently 68
degrees and read "Heat On" again. Again, I switched it to "Off" and
back to "Auto" again and it everything kicked in as expected.

I, by no means, am an HVAC expert. I am obviously going to call the
HVAC company in tomorrow (too late tonight) to have them take a look
at it. I was just hoping that I could get a heads up to what might be
the problem so that I'm not taken tomorrow.

Any thoughts?

Posted by geothermaljones on February 3, 2009, 11:26 pm

Call the installer ASAP...
18 mo. system old ought to be under warranty.
All you can really do is switch the fan control from Auto to On to see if
the blower is working.
Either way it needs someone qualified to take a look...

goodluck
geothermaljones

>I have a newer furnace (about 18 months old) in a new home (just as
> old). I noticed the other day that I heard the furnace exhaust fan
> go, followed by the gas starting to burn. A few minutes went by and
> the blower never kicked in. After a few minutes, I checked the
> thermostat. It read "Heat On", but it wasn't blowing any air. At
> this point, the gas had to be burning for 5 minutes. I turned it to
> "Off" and then back to "Auto". It then went through the same
> routine.... exhaust on, gas on and finally followed by the blower. I
> thought it was weird and figured I would keep my eye on it.
> Today, I notice it was a bit cold in the house, but didn't think
> anything of it. I got up and heard the gas running again, but noticed
> that the furnace wasn't blowing. I checked the thermostat again.
> This time, the thermostat was set to 70 degrees, but was currently 68
> degrees and read "Heat On" again. Again, I switched it to "Off" and
> back to "Auto" again and it everything kicked in as expected.
> I, by no means, am an HVAC expert. I am obviously going to call the
> HVAC company in tomorrow (too late tonight) to have them take a look
> at it. I was just hoping that I could get a heads up to what might be
> the problem so that I'm not taken tomorrow.
> Any thoughts?

Posted by ATJaguarX on February 4, 2009, 12:09 am

wrote:

> Call the installer ASAP...
> 18 mo. system old ought to be under warranty.
> All you can really do is switch the fan control from Auto to On to see if
> the blower is working.
> Either way it needs someone qualified to take a look...
> =A0 =A0 =A0 =A0 goodluck
> =A0 =A0 =A0 =A0 geothermaljones

> >I have a newer furnace (about 18 months old) in a new home (just as
> > old). =A0I noticed the other day that I heard the furnace exhaust fan
> > go, followed by the gas starting to burn. =A0A few minutes went by and
> > the blower never kicked in. =A0After a few minutes, I checked the
> > thermostat. =A0It read "Heat On", but it wasn't blowing any air. =A0At
> > this point, the gas had to be burning for 5 minutes. =A0I turned it to
> > "Off" and then back to "Auto". =A0It then went through the same
> > routine.... exhaust on, gas on and finally followed by the blower. =A0I
> > thought it was weird and figured I would keep my eye on it.
> > Today, I notice it was a bit cold in the house, but didn't think
> > anything of it. =A0I got up and heard the gas running again, but notice=

> > that the furnace wasn't blowing. =A0I checked the thermostat again.
> > This time, the thermostat was set to 70 degrees, but was currently 68
> > degrees and read "Heat On" again. =A0Again, I switched it to "Off" and
> > back to "Auto" again and it everything kicked in as expected.
> > I, by no means, am an HVAC expert. =A0I am obviously going to call the
> > HVAC company in tomorrow (too late tonight) to have them take a look
> > at it. =A0I was just hoping that I could get a heads up to what might b=

> > the problem so that I'm not taken tomorrow.
> > Any thoughts?- Hide quoted text -

> - Show quoted text -

I apologize... I made a mistake in my original post. I turn the
thermostat from "Heat" to "Off". When doing this, I hear the gas turn
off. Switching back to "Heat" again fixes everything.

When I noticed that the gas was running and the fan was not, I did
attempt to turn the fan from "Auto" to "On". This did turn the fan
on, but did not blow warm air. The only way to get it to "reset" was
by flipping the switch from "Heat" to "Off" and back to "Heat" again.

Posted by ATJaguarX on February 4, 2009, 12:11 am

wrote:

> > the problem so that I'm not taken tomorrow.
> > Any thoughts?- Hide quoted text -

> - Show quoted text -

The blower fan does work. It seems like everything is in line.. but
something isn't telling the blower to turn on.

Posted by Hermann on February 4, 2009, 3:18 am

ATJaguarX wrote:

> wrote:

>> Call the installer ASAP...
>> 18 mo. system old ought to be under warranty.
>> All you can really do is switch the fan control from Auto to On to see if
>> the blower is working.
>> Either way it needs someone qualified to take a look...
>> goodluck
>> geothermaljones

>>> I have a newer furnace (about 18 months old) in a new home (just as
>>> old). I noticed the other day that I heard the furnace exhaust fan
>>> go, followed by the gas starting to burn. A few minutes went by and
>>> the blower never kicked in. After a few minutes, I checked the
>>> thermostat. It read "Heat On", but it wasn't blowing any air. At
>>> this point, the gas had to be burning for 5 minutes. I turned it to
>>> "Off" and then back to "Auto". It then went through the same
>>> routine.... exhaust on, gas on and finally followed by the blower. I
>>> thought it was weird and figured I would keep my eye on it.
>>> Today, I notice it was a bit cold in the house, but didn't think
>>> anything of it. I got up and heard the gas running again, but noticed
>>> that the furnace wasn't blowing. I checked the thermostat again.
>>> This time, the thermostat was set to 70 degrees, but was currently 68
>>> degrees and read "Heat On" again. Again, I switched it to "Off" and
>>> back to "Auto" again and it everything kicked in as expected.
>>> I, by no means, am an HVAC expert. I am obviously going to call the
>>> HVAC company in tomorrow (too late tonight) to have them take a look
>>> at it. I was just hoping that I could get a heads up to what might be
>>> the problem so that I'm not taken tomorrow.
>>> Any thoughts?- Hide quoted text -

>> - Show quoted text -

>
> The blower fan does work. It seems like everything is in line.. but
> something isn't telling the blower to turn on.

Maybe replace the logic control board. Fan-on timer/relay possibly shot
on the board.

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