Forced Air Furnace not reaching thermostat setting
 

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?

Forced Air Furnace not reaching thermostat setting
 

Joe,
Two excellent suggestions. The thermostat is an older model that has
"adaptive setting" that is disengaged. Do you know where the high
heat sensor might be located? Is it part of the temperature fan
controller?

Thanks,

On Feb 19, 4:33*pm, "Joseph Meehan"
wrote:
* * Get the instructions for the thermostat out and take a look for anything
a bout an anticipator. *It may not be set properly for your furnace.

* * The other idea that comes to mind is that a high heat sensor on the
furnace is kicking in for some reason.

--
Joseph Meehan

*Dia 's Muire duit

wrote in message

...



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?- Hide quoted text -

- Show quoted text -

Forced Air Furnace not reaching thermostat setting
 

On Feb 19, 5:03*pm, wrote:
Joe,
Two excellent suggestions. *The thermostat is an older model that has
"adaptive setting" that is disengaged. *Do you know where the high
heat sensor might be located? *Is it part of the temperature fan
controller?

Thanks,

On Feb 19, 4:33*pm, "Joseph Meehan"
wrote:



* * Get the instructions for the thermostat out and take a look for anything
a bout an anticipator. *It may not be set properly for your furnace.

* * The other idea that comes to mind is that a high heat sensor on the
furnace is kicking in for some reason.

--
Joseph Meehan

*Dia 's Muire duit

wrote in message

...

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)

How do you know it's the high limit that's turning off the furnace?
If it is, then that would indicate either there isn't sufficient air
flow, or the high limit switch is cutting off the furnace at a normal
operating temp.

It's also easy to rule out if this has anything to do with the
thermostat. Set the thermostat way higher than room temp and if the
furnace still cuts off the same way instead of running, it;s not the
thermostat.




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?- Hide quoted text -

- Show quoted text -- Hide quoted text -

- Show quoted text -

Forced Air Furnace not reaching thermostat setting
 

On Feb 19, 6:10*pm, wrote:
On Feb 19, 5:03*pm, wrote:





Joe,
Two excellent suggestions. *The thermostat is an older model that has
"adaptive setting" that is disengaged. *Do you know where the high
heat sensor might be located? *Is it part of the temperature fan
controller?

Thanks,

On Feb 19, 4:33*pm, "Joseph Meehan"
wrote:

* * Get the instructions for the thermostat out and take a look for anything
a bout an anticipator. *It may not be set properly for your furnace.

* * The other idea that comes to mind is that a high heat sensor on the
furnace is kicking in for some reason.

--
Joseph Meehan

*Dia 's Muire duit

wrote in message

....

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)

How do you know it's the high limit that's turning off the furnace?
If it is, then that would indicate either there isn't sufficient air
flow, or the high limit switch is cutting off the furnace at a normal
operating temp.

It's also easy to rule out if this has anything to do with the
thermostat. * Set the thermostat way higher than room temp and if the
furnace still cuts off the same way instead of running, it;s not the
thermostat.



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?- Hide quoted text -

- Show quoted text -- Hide quoted text -

- Show quoted text -- Hide quoted text -

- Show quoted text -- Hide quoted text -

- Show quoted text -

Forced Air Furnace not reaching thermostat setting
 

On Feb 19, 6:03 pm, 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.

Forced Air Furnace not reaching thermostat setting
 

Forced Air Furnace not reaching thermostat setting
 

On Tue, 19 Feb 2008 13:04:02 -0800 (PST), 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/

Forced Air Furnace not reaching thermostat setting
 

On Mar 4, 12:28*am, wrote:
On Tue, 19 Feb 2008 13:04:02 -0800 (PST), 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?




--
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 -

Forced Air Furnace not reaching thermostat setting
 

On Tue, 4 Mar 2008 05:35:53 -0800 (PST), wrote:

On Mar 4, 12:28*am, wrote:
On Tue, 19 Feb 2008 13:04:02 -0800 (PST), 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/

Forced Air Furnace not reaching thermostat setting
 

On Mar 5, 9:42 pm, wrote:
On Tue, 4 Mar 2008 05:35:53 -0800 (PST), wrote:
On Mar 4, 12:28 am, wrote:
On Tue, 19 Feb 2008 13:04:02 -0800 (PST), 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. Thefurnacehas 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.Furnacemakes 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.Gaslights and stays on for about (4 minutes)
8.Furnaceturns off without reaching thermostat setting

I can shut the power off to reset thefurnaceand 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 thefurnacehigh limit
control shutting down thefurnace?

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 onlinehttp://pmilligan.net/palm/

I hae similar symptoms. Well, my furnace does.
A repair tech, who's opinion I generally respect, also suggested the
thermostat and seemed to be very sure that it was probably a battery
issue when I said I couldn't remember the last time I changed them.
The original thermostat was a round dial, nothing more than a mercury
switch on a bi-metallic coil, so I emulated that by taking the modern
digital set-back stat out of the equation and jumpering the two wires
together, which didn't change the symptoms.
BTW, my furnace is about 35 years old - Amana GH-120DE and I can't
find an induced draft motor, just a direct drive squirrel cage blower
at the bottom.
I replaced the fan and limit control, the flue is clear (enough).

Any help appreciated, but I can't afford to chuck it out.

Forced Air Furnace not reaching thermostat setting
 

I have similar symptoms. Well, my furnace does.
A repair tech, who's opinion I generally respect, also suggested the
thermostat and seemed to be very sure that it was probably a battery
issue when I said I couldn't remember the last time I changed them.
The original thermostat was a round dial, nothing more than a mercury
switch on a bi-metallic coil, so I emulated that by taking the modern
digital set-back stat out of the equation and jumpering the two wires
together, which didn't change the symptoms.
BTW, my furnace is about 35 years old - Amana GH-120DE and I can't
find an induced draft motor, just a direct drive squirrel cage blower
at the bottom.
I replaced the fan and limit control, the flue is clear (enough).

Any help appreciated, but I can't afford to chuck it out.