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Forced Air Furnace not reaching thermostat setting shep999 02-19-2008
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Posted by on February 19, 2008, 11:04 pm
On Feb 19, 6:03 pm, shep...@gmail.com wrote:
> > > > > Is there anything anyone has to offer on what might be tripping the
> > > > > furnace?- Hide quoted text -

The limiters might be shutting it down due to decreased air flow
either in the combustion air flow or the blower air flow.
Often there is gunk in the combustion motor housing which you can
clean with a pipe cleaner.
Or harder to fix is gunk in the heater core itself which requires a
professional take down.

Radiant Heat 468x60
Posted by Zyp on February 20, 2008, 11:46 am
shep999@gmail.com wrote:
> My Amama 115,000 btu forced air system (1987) with White-Rodgers
> controller is not reaching its thermostat setting. My thermostat is a
> Honeywell set-back model. The furnace has a particular problem in the
> morning to raise the temperature from the low temperature that is used
> at night.
>
> 1. Thermostat calls for heat.
> 2. Induced Draft motor starts
> 3. Furnace makes a clicking noise and ignitor turns on
> 4. Blower turns on.
> 5. High temperature limit turns off burners (after 4 minutes)
> 6. Ignitor turns on
> 7. Gas lights and stays on for about (4 minutes)
> 8. Furnace turns off without reaching thermostat setting
>
> I can shut the power off to reset the furnace and it will light off
> again for about 15 minutes again. I have changed the Flame senor to
> be sure that it is not causing the problem.
>
> Is there anything anyone has to offer on what might be tripping the
> furnace?

Shep;

Sounds like a dirty air filter or the cooling coil is blocked from a build
up of material [dirt.] A high limit control trip is a clear sign that
there's an airflow problem. Make sure the filter is clean, all the supply
registers are open and you can "feel" air flow when the unit runs the fan.
If not, look at the duct or the evaporator coil for a blockage.


--
Zyp



Posted by on March 4, 2008, 12:28 am
On Tue, 19 Feb 2008 13:04:02 -0800 (PST), shep999@gmail.com wrote:

>My Amama 115,000 btu forced air system (1987) with White-Rodgers
>controller is not reaching its thermostat setting. My thermostat is a
>Honeywell set-back model. The furnace has a particular problem in the
>morning to raise the temperature from the low temperature that is used
>at night.
>
>1. Thermostat calls for heat.
>2. Induced Draft motor starts
>3. Furnace makes a clicking noise and ignitor turns on
>4. Blower turns on.
>5. High temperature limit turns off burners (after 4 minutes)
>6. Ignitor turns on
>7. Gas lights and stays on for about (4 minutes)
>8. Furnace turns off without reaching thermostat setting
>
>I can shut the power off to reset the furnace and it will light off
>again for about 15 minutes again. I have changed the Flame senor to
>be sure that it is not causing the problem.
>
>Is there anything anyone has to offer on what might be tripping the
>furnace?
It's the thermostat. Go to Home Depot get a new one and your good to
go.

--
Click here every day to feed an animal that needs you today !!!
http://www.theanimalrescuesite.com/

Paul ( pjm @ pobox . com ) - remove spaces to email me
'Some days, it's just not worth chewing through the restraints.'
'With sufficient thrust, pigs fly just fine.'
HVAC/R program for Palm PDA's
Free demo now available online http://pmilligan.net/palm/

Posted by on March 4, 2008, 8:35 am
On Mar 4, 12:28=A0am, .p.jm@see_my_sig_for_address.com wrote:
> On Tue, 19 Feb 2008 13:04:02 -0800 (PST), shep...@gmail.com wrote:
> >My Amama 115,000 btu forced air system (1987) with White-Rodgers
> >controller is not reaching its thermostat setting. =A0My thermostat is a
> >Honeywell set-back model. =A0The furnace has a particular problem in the
> >morning to raise the temperature from the low temperature that is used
> >at night.
>
> >1. Thermostat calls for heat.
> >2. Induced Draft motor starts
> >3. Furnace makes a clicking noise and ignitor turns on
> >4. Blower turns on.
> >5. High temperature limit turns off burners (after 4 minutes)
> >6. Ignitor turns on
> >7. Gas lights and stays on for about (4 minutes)
> >8. Furnace turns off without reaching thermostat setting
>
> >I can shut the power off to reset the furnace and it will light off
> >again for about 15 minutes again. =A0I have changed the Flame senor to
> >be sure that it is not causing the problem.
>
> >Is there anything anyone has to offer on what might be tripping the
> >furnace?
>
> It's =A0the thermostat. =A0Go to Home Depot get a new one and your good to=

> go.
>

Please explain how a bad thermostat results in the furnace high limit
control shutting down the furnace?




> --
> Click here every day to feed an animal that needs you today !!!http://www.=
theanimalrescuesite.com/
>
> Paul ( pjm @ pobox . com ) - remove spaces to email me
> 'Some days, it's just not worth chewing through the restraints.'
> 'With sufficient thrust, pigs fly just fine.'
> HVAC/R program for Palm PDA's
> Free demo now available onlinehttp://pmilligan.net/palm/- Hide quoted text=
-
>
> - Show quoted text -


Posted by on March 5, 2008, 9:42 pm
On Tue, 4 Mar 2008 05:35:53 -0800 (PST), trader4@optonline.net wrote:

>On Mar 4, 12:28 am, .p.jm@see_my_sig_for_address.com wrote:
>> On Tue, 19 Feb 2008 13:04:02 -0800 (PST), shep...@gmail.com wrote:
>> >My Amama 115,000 btu forced air system (1987) with White-Rodgers
>> >controller is not reaching its thermostat setting.  My thermostat is a
>> >Honeywell set-back model.  The furnace has a particular problem in the
>> >morning to raise the temperature from the low temperature that is used
>> >at night.
>>
>> >1. Thermostat calls for heat.
>> >2. Induced Draft motor starts
>> >3. Furnace makes a clicking noise and ignitor turns on
>> >4. Blower turns on.
>> >5. High temperature limit turns off burners (after 4 minutes)
>> >6. Ignitor turns on
>> >7. Gas lights and stays on for about (4 minutes)
>> >8. Furnace turns off without reaching thermostat setting
>>
>> >I can shut the power off to reset the furnace and it will light off
>> >again for about 15 minutes again.  I have changed the Flame senor to
>> >be sure that it is not causing the problem.
>>
>> >Is there anything anyone has to offer on what might be tripping the
>> >furnace?
>>
>> It's  the thermostat.  Go to Home Depot get a new one and your good to
>> go.
>>
>
>Please explain how a bad thermostat results in the furnace high limit
>control shutting down the furnace?
>
Email and I can go over the details. Alot of techs miss this and
blame the limit.
>
>
>
>> --
>> Click here every day to feed an animal that needs you today
!!!http://www.theanimalrescuesite.com/
>>
>> Paul ( pjm @ pobox . com ) - remove spaces to email me
>> 'Some days, it's just not worth chewing through the restraints.'
>> 'With sufficient thrust, pigs fly just fine.'
>> HVAC/R program for Palm PDA's
>> Free demo now available onlinehttp://pmilligan.net/palm/- Hide quoted text -
>>
>> - Show quoted text -

--
Click here every day to feed an animal that needs you today !!!
http://www.theanimalrescuesite.com/

Paul ( pjm @ pobox . com ) - remove spaces to email me
'Some days, it's just not worth chewing through the restraints.'
'With sufficient thrust, pigs fly just fine.'
HVAC/R program for Palm PDA's
Free demo now available online http://pmilligan.net/palm/

Page 2 of 3       < 1 2 3 > last >>
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