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.
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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.