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Posted by Noon-Air on February 26, 2007, 8:52 am
> Rudd Model= UGAA-10EC, Serial #=TN3D104 M2779 3228
> Electronic Ignition Furnace (Spark)
>
> Problem: Originally, the pilot light worked but the main burners would not
> light. I cleaned the Flame Sensor tip with some light sand paper. Now,
> the main burners will light but they quickly shut off after about 10-30
> secs. If I hold a long-stick candle lighter to the Flame sensor when the
> main burner lights I can get the sensor hot enought to keep the furnace
> going for a several minutes.
>
> OK, so bad sensor and/or weak flame? Does the sensor need to be glowing
> red hot? The flame looks ok to me, but a Tech I called who is out of
> state said the gas company is putting something in the gas that is
> clogging up the furnaces. My problem just started last night. I'm
> thinking about removing the small gas line from the controller to the
> pilot-light point and clean it out from end to end. Next step replace the
> sensor (Automatic Pilot E1 Type 3098-136). I was also wondering if this
> has a gas filter I could change? The GAS controller has several numbers on
> it 7921 E11, also has Model 36c84, type 220, 24v 60hz, max pr 1/2 psi,
> filter cap 2cfh air.
>
> Thanks for your time.
Here's the short and sweet of it.... that is a 100,000 natural gas furnace
with a 2 ton, direct drive blower, and was manufactured in the 27th week of
1979...... that makes it 27 years old. They only build them to last 18 - 20
years with correct installation and proper maintenance. Its long past time
to replace the furnace with a new one.
There is a high probablility that the new furnace will pay for itself in
just a couple of years in energy savings and keep you a lot more
comfortable.
BTW, your furnace is shutting down on a safety, and screwing around with it,
without finding out what the root cause of the problem is, and correcting
it, could be potentially dangerous to you and your family.
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