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Burners won't light in older furnace

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Burners won't light in older furnace tysonjm 01-14-2007
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Posted by on January 14, 2007, 7:48 pm
Thanks for taking a look...I figured our Magic Chef furnace wasn't too
promising when we bought this place 2 yrs. ago. You might be right on
the gas valve since when I hear the repeated clicking, I'm seeing a
spark emitting each time...it seems to get the pilot going, but I
assume that spark is also supposed to get the burners rolling, but not
enough gas?

Yeah, the SoCal chill...I guess we don't have it so bad considering
other parts of the country, but it's enough to warrant turning on the
heater you'd expect to work!


gofish@gonefishin.net wrote:
> tysonjm@yahoo.com wrote:
>
> >Thanks, here are the pics based on what you described. See if they're
> >sufficient...I'm just not sure what/where the flame sensor is supposed
> >to be.
> >
> >I'll stand by, and let me know if you need more info - thx!
> >
> >http://www.icedpita.com/images/furnace3.jpg
> >http://www.icedpita.com/images/furnace4.jpg
> >
>
>
> partner, you need serious help. Magic Chef should have stuck with
> what they do best, which is NOT building furnaces....
>
> An early 80's model you say?
>
> so if you have a pilot......AND you know how to apply 24v to the gas
> valve....you may get lucky & have heat temporarily. I'm betting the
> gas valve is toasted and no matter WHAT you do, you aint gonna have
> heat. now a sharp cookie could put you in a retrofit kit for $750,
> but hell, thats a down pymt on a brand new furnace....
>
> I'm guessing you're in So Cal. what do you think of that bitter
> freeze we're getting?


Posted by danger@heat.com on January 14, 2007, 8:35 pm
Looks like a flame switch. I think you have a small white spark relight
module, and a flame switch that plugs into the gas valve. You could have a
bad flame switch or gas valve, or just a dirty pilot not hot enough to close
the hot side of the flame switch.


Or your electrode might be the flame sensor, if wired to a module with mv, pv
spark terminals..you could have a bad module or a dirty electrode/sensor.

-Canadian Heat


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Posted by on January 17, 2007, 4:00 pm
Thanks, Canadian Heat...is a flame switch easy to find AND install to
see if that's the problem, or is this an obscure part to find for this
old of furnace and/or require a professional?

danger@heat.com wrote:
> Looks like a flame switch. I think you have a small white spark relight
> module, and a flame switch that plugs into the gas valve. You could have a
> bad flame switch or gas valve, or just a dirty pilot not hot enough to close
> the hot side of the flame switch.
>
>
> Or your electrode might be the flame sensor, if wired to a module with mv, pv
> spark terminals..you could have a bad module or a dirty electrode/sensor.
>
> -Canadian Heat
>
>
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> Posted with NewsLeecher v3.7 Final
> Web @ http://www.newsleecher.com/?usenet
> ------------------- ----- ---- -- -


Posted by Power's Mechanical on January 17, 2007, 5:16 pm

tysonjm@yahoo.com wrote:
> Thanks, Canadian Heat...is a flame switch easy to find AND install to
> see if that's the problem, or is this an obscure part to find for this
> old of furnace and/or require a professional?
>
Its actually called a auto pilot. Readily available and made by White
Rodgers. Its a mecury switch has to be properly disposed of. Not just
tossed into the trash.

snip


Posted by danger@heat.com on January 17, 2007, 7:55 pm
Well if your pilot lights and the ticking stops, I'm assuming the auto relight
is satisfied, and the gas valve is waiting for the flame switch to open.

The chances are greater the mercury flame switch is the problem rather then
the gas valve. If the pilot is dirty and the little flame doesnt heat the
flame switch up then the burner won't light. I usually remove the pilot
orifice and try to clean that. Or just blow and suck on the pilot tubing
while you hit the pilot hood with a wrench. Mercury switch is very easy to
replace. Make sure not to unravel the capillary anymore then needed. And
keep note of where the existing rod is sitting, inside the pilot assembly.
You want it to sit just right inside the flame. Normally after the pilot
lights it showed take no more then 120sec to open the gas valve. 30sec is
what I am used to waiting.

-Canadian Heat



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