We restored a motorhome last year. I bypassed the water line on the water heater so we could used the MH. the water heater had multiple hole in it. Before I removed it I fire it up to make sure it worked and it did. I replaced the tank and put the old controls back on. When I used it, it lit fine but every once in awhile the flame would back down the tube to the orifice. The tube has an adjustment there with slots all around. Does that have to be adjusted a certain way to prevent the flame backing up?