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I did that also-the opening was CRYSTAL CLEAR-like it was brand new.
Air did flow through without obstruction. Any other suggestions?
Yes, it is a standing pilot unit-attached to one of the gas tubes.
I cleaned the heck out of that thing and, like I said, installed a new thermocouple. So you think it is the gas control valve? Should I:
1) call the gas co (Laclede Gas) and have them look at it?
2) call a local heating & A/C company instead?