Furnace blower not turning on when it should

Posted by HVAC on February 4, 2009, 6:16 am

>> 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.

Stormy? Is that you?

Posted by Alexander on February 5, 2009, 12:54 am

HVAC wrote:

>>> 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.

>
>
> Stormy? Is that you?

No! Are you Mr Obama's tax evading appointee to head up alt.hvac?

>
>

Posted by ATJaguarX on February 4, 2009, 8:26 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=

> >> 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 an=

> >>> the blower never kicked in. =A0After a few minutes, I checked the
> >>> thermostat. =A0It read "Heat On", but it wasn't blowing any air. =A0A=

> >>> this point, the gas had to be burning for 5 minutes. =A0I turned it t=

> >>> "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 noti=

ced

> >>> 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" an=

> >>> 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 th=

> >>> 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=

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

> > The blower fan does work. =A0It 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.- Hide quoted text -
> - Show quoted text -

Should something like this be covered under warranty? Like I had
mentioned in my OP, the house and furnace are both 16 - 18 months old.

Posted by Alexander on February 5, 2009, 12:56 am

ATJaguarX wrote:

>> 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.- Hide quoted text -
>> - Show quoted text -

>
> Should something like this be covered under warranty? Like I had
> mentioned in my OP, the house and furnace are both 16 - 18 months old.

You have the warrantee in with your manuals. Read and profit.

Posted by ATJaguarX on February 4, 2009, 8:27 am