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Hi my name is ***** ***** I have been in the plumbing field for 20 years. I will be glad to help you today. Is the pilot lit? Is this a new installation or existing water heater that stopped working?
You may just have to bleed the air out of the line. If you loosen the connection and let a little bit of gas leak out then tighten when you smell the gas. I imagine when they fiddled with it as described before it eventually bled the line out.