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Janitrol 20-125 gas furnace will not fire?

I have moved into a rental home and the previous tenant had turned the gas supply off to the furnace, a Janitrol 20-125... old monster. I attempted to run it for the first time this year and it will not fire, I turned the gas supply on and lit the pilot


First the obviouse question: Is the gas valve in the on postion?

Try giving the GV a thump. Sometimes they will stick... and the hissing noise is not uncommon.

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