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First thing to check is, do you have gas to the pilot. To do this you need to disconnect the pilot burner tubing at the gas valve and see if you have gas at that port while the igniter is arcing. If you do have gas there then you need to clean the pilot burner and the pilot burner orifice. If you don't then you need to check for 24 vac to the pilot valve terminals on the gas valve. On a newer unit these terminals are usually PV & PV/MV. I don't know what the terminal designation would be for your 20+ year old unit.
The pilot burner is attached to the end of the aluminum tubing. The pilot burner is usually attached to one of the burners. So once you disconnect the tubing you can slide the burner off the manifold then pull it out. The orifice is usually a small thimble shaped object inside the burner. It mat come out on the the end of the tubing when you disconnect it from the burner. You must pass a very fine wire through the tiny hole (~).01")in the orifice.
The orifice is in the pilot burner. The orifice is usually a small thimble shaped object inside the burner. It may come out on the the end of the pilot tubing when you disconnect it from the burner. You must pass a very fine wire through the tiny hole (~).01")in the orifice.
It should come on when the main burner fires up
Yes the pilot lights first. The orifice is probably inside the pilot burner if it didn't fall out when you disconnected the tubing.