Do you have to worry when the grill starts to make whistling or humming sounds? In some cases it can happen that a gas grill makes a quiet humming sound. This is no cause for concern providing you do not smell gas. The humming is caused by internal vibrations from the pressure regulator. There are a number of reasons for this: air temperature, air humidity, air pressure or the volume of gas in the bottle. In some cases the humming only occurs under certain weather conditions. If the gas grill sounds do not stop you can either exchange your pressure regulator or simply continue to grill as normal. It may sound a little strange. But don’t worry – it’s completely harmless.