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I was on a service call today on a Trane relia Tel gas pack. When I was wait on heat sequence it energize the gas valve in the valve started buzzing really loud. So I thought I had a bad gas valve. Before installing the new valve I plugged it up and checked it. Value was fine. Took the old one off, Installed the new one and it started buzzing aswell but if its just laying there not hooked up to gas line works fine.. so confused.. Please help!!