Most accidents with gas barbecues and other gas appliances occur because of gas leaks between the gas bottle and the regulator. Find out how to change a gas bottle safely and correctly.
If the regulator is not seated properly on the gas bottle, propane gas could leak out. If the gas catches fire, the bottle could also catch fire and explode. Press the locking ring on the regulator fully down to avoid leaks.
The regulator switch should be closed when the appliance is not in use. If you're going away for a while, or won't be using the gas for some time, the regulator switch must be closed and the regulator disconnected.