heat turns pilot light off
Hello, all. I have spent the better part of this last week trying to figure out why my Williams natural gas wall heater (cerca 1970's) pilot light went out this last week. There was a cold snap, and I happened to be standing at the thermostat when the heater tried to kick on. There was a brief flash of the burners igniting in a normal fashion, then they turned off. I looked inside and found the pilot off, so I tried to relight the pilot, but it will not stay lit if I release the pilot button. This furnace uses the old 2 wire millivolt system and pilot generator (PG9 type). I cleaned the pilot and generator. I turned up the pilot flame. I tried removing the thermostat wires to see if it was grounding out, but that did not help. I got a millivolt meter, and the generator is putting out about 750mV. The pilot would still not stay lit once I released the pilot button. I wasn't sure if there was enough current (what is the current produced by these generators anyway?), so I hooked a 1.5V C battery up to the millivolt connections. Wow, the pilot stayed lit with that much voltage. So I bought another generator and now have both generators together in there putting out about 1000mV (1V) which seems to keep the pilot lit. But the pilot still goes out when I turn on the heat (ie. when I turn up the setting on the thermostat to trigger the burners to ignite, or if I jump the thermostat terminals) and the main burners never light. What's up? Bad gas valve or some kind of short?