Gaffers & Sattler furnace - pilot light won't stay lit

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Old 10-28-09, 09:13 PM
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Gaffers & Sattler furnace - pilot light won't stay lit

Hi all,

I have a Gaffers and Sattler forced-air gas furnace, model 100 FEF.

I can't get the pilot light to stay lit.

This model has a valve you turn hard counterclockwise to turn on the gas to the pilot light. I crank it over, hear the hiss, hold it there, and light the pilot light. I let it run for a while, then back off on the valve. The pilot light immediately goes out.

I set up an arrangement with a clamp and bungee cord to keep the valve cranked over and left the pilot light burning while we had dinner. After dinner, the pilot light still went out after I removed the bungee cord.

I'm comfortable doing my own simple repairs and installation of replacement parts. I'm guessing that the flame sensor is bad, but don't have enough experience to know for sure. Plus I don't know where to find parts for this old furnace.

Any advice?

Thanks,

Doug
 
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Old 10-28-09, 11:50 PM
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Only about 10% of the time is the problem going to be a bad thermocouple.


70% or so the problem is a dirty pilot burner. Does the pilot burner look like a small blow torch, with a sharp flame engulfing the tip of the thermocouple?

Or is it a soft, lazy flame more like that of a candle, perhaps with yellow tips to the flame?

If it's the second, the pilot burner needs to be disassembled and cleaned, with the aluminum pilot tubing removed by loosening the brass ferrule so that the pilot orifice can be removed and cleaned.
 
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Old 10-29-09, 09:24 PM
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Thanks for the reply!

The flame looks like a little blowtorch, partly diverted onto the thermocouple and the rest aimed into the burners. Looks pretty healthy to me. The thermocouple glows a dull red at the tip after a few minutes in the flame.

I bought a new thermocouple anyway (< $10) and installed it. Didn't help.

I didn't know what else to do so I started taking stuff apart.

Long story short: I figured out that you have to crank the knob clockwise HARD to operate the gizmo in the bottom of the valve. Holding it open just enough to allow the gas to flow doesn't do the job. Otherwise, the magnetic latch won't work and the pilot light won't stay on.

The furnace is now working and the house is nice and warm.

Thanks for the help!

Doug
 
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Old 10-13-10, 11:24 PM
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How to clean pilot burner?

I know this thread is a year old, but I was hoping someone might be able to answer a question.

I have an old Gaffers & Sattler furnace with a weak pilot flame that won't activate the thermocoupler. I removed the pilot burner assembly and disassembled it into the burner "nozzle" and the small silver tubing. I cleaned out the nozzle with a fine wire and used cleaning solution to try and clean the unit, as well as the tubing. There wasn't that much dirt buildup.

Air flows freely through the tubing, however, the fitting on the burner that attaches to the tubing only allows limited airflow, as if it's acting as a valve. Is this how it's supposed to function, or is this fitting clogged in some way? I tried pushing a thin wire through the fitting, but it seems to be obstructed (or perhaps the hole is tapered and gets smaller inside the body of the burner). I didn't see a pilot flame adjustment screw anywhere.

Thanks.
 
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Old 10-14-10, 09:45 AM
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Sorry, but I can't recognize if there is a problem with the pilot orifice based on your description.
 
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Old 10-14-10, 11:06 AM
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I found some finer wire and recleaned the orifice. The flame is now strong and reaches the thermocoupler. However, I noticed that there are two flames coming out of the pilot burner - one is directed at the thermocoupler (bolted to the side of the burner) and another larger flame points straight out of the end. It looks like this is intended (there are two "gaps" at the end of the burner). Does anyone know the purpose of this second flame? It seems that it's just a waste of gas.
 

Last edited by mark754; 10-14-10 at 12:15 PM.
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Old 10-14-10, 02:35 PM
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Usually one part of the pilot flame is directed at the thermocouple and the other out over the burner ports to light the main burner.
 
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Old 10-14-10, 04:09 PM
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That makes sense. Thanks.
 
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