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QUESTION: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.
ANSWER: 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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