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 -