I have some Marco 792775 gas logs, from the mid to late 90s. They haven't been used in 20 years. I don't have the manual, and I haven't been able to find it online. Seems the company went out of business a while ago.
They have a control knob that's different than what I'm used to for most gas logs... it looks like this:
I've had no trouble getting the pilot going. Turn the knob to pilot, press it in, gas starts flowing, hit the piezo-electric button, and boom, flame. If I keep it in for a while, the thermocouple heats up and the pilot stays lit. Great.
Turning the knob to off cuts the gas to the pilot, and it goes out 20-30 seconds later, as expected.
What I'm struggling with is actually getting the logs to fully light. Just once, I was able to turn the knob counter-clockwise past the pilot position (I think I depressed it, but I'm not 100% sure) and over towards LO and HI. The logs lit. However, every time since then, when I try to do this, the knob won't turn past pilot. I've tried turning with the knob depressed, turning with it not depressed, starting at the off position, starting at the pilot position, turning clockwise just in case, etc. Nothing seems to allow the knob to turn over to the actual running positions.
My theories are 1) the knob is broken, 2) there's some sort of safety mechanism that has engaged and won't let me turn the knob, or 3) I'm making some silly, embarrassing mistake.
Can anybody speak to these theories? Does anybody have experience with Marco logs and know how the knob is supposed to work?