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Thank you very much for taking the time to type this up. I started playing around with it again a few days ago and finally got it changed. Lost track of how I got to it though.

Mine has a set of...

Thanks Heat. It seems to be working OK the last 18 hours or so. What should the vacuum range be? The place I retired from may have a gauge that I could borrow.

One other thing, this silicone...

This thermostat is at least 10-11 years old I believe. At one point it had a temperature differential of either 2 or 3 degrees. Somewhere along the line it started working with a one degree...

I have a Goodman GMP 100-4 running on propane The last week or so, has seen some intermittent operation. The draft inducement motor comes on but at times no ignition occurs. Vacuum manually applied...