Originally Posted by Hettinga
Any leads on finding a gas control valve for this?
No idea where you can get a replacement valve, but looking at your pictures, that valve looks VERY similar to mine. My furnace is a Coleman ST-200, model 4312, of the same vintage ('81 Trillium
5500). Compared to mine, looks like yours has the valve mounted sideways. Here's mine:
Looking for an ST-200 valve may enlarge the number of hits in your search.
Also, there are a couple ST-200 manuals in the document section. One shows that the flat head screw just besides the red knob is actually the pilot burner adjustment.
The issue I had with my furnace was a bit different, the pilot wouldn't lit at all. Turned out the pilot burner was clogged with rust, dirt, etc. I took it out, cleaned everything up, and afterwards everything worked normally, the pilot staying lit after I released the red knob.
Your pilot going out when you let the button go reminds me of an issue I've had a few years back with my popup fridge
. Now you problem may be entirely different, but I'll tell you the story anyway, just in case.
just would stay lit, just like your furnace pilot. I checked the thermocouple, regulator, switched tanks, no change. I my search for an answer, one of the possible causes was what is called an "interrupter". Basically, the thermocouple screws in this interrupter, then the interrupter screws in the main valve. The interrupter has to blade-type terminals, on which a switch can be wired. The switch allows to cut the electrical
path from the thermocouple to the gas valve, shutting it off. Mine looked like this, but it may look differently on other systems:
Now as I said, this may not relate at all to your furnace issue, and I have no idea if your furnace is designed with such an interrupter, but if it does you may want to check it out (you can simply bypass it to test it) with its related wiring and switch.