Hi all I have my sons caravan at home for the winter today thought I would run the gas to keep things working. In the locker it’s got a manual switch over device so you can change between the 2 bottles .last week one of the bottles said quarter full lite the fire and it went out the bottle was empty. Switched over to the new bottle lite fire all ok went back to the locker showing full on gauge but I could here a slight hissing sound coming from the gauge area should it do that I could not smell gas many thanks darren