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Posted by RegB on March 8, 2008, 5:16 pm
On Mar 5, 9:42 pm, .p.jm@see_my_sig_for_address.com wrote:
> On Tue, 4 Mar 2008 05:35:53 -0800 (PST), trad...@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. 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.
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