Whenever you switch the circuit labeled "LP Gas Valve" on, a solenoid inside the LP gas locker is energized, allowing gas to flow to the appliances in the cabin. This lamp, located on your master panel, warns of that gas is flowing. It is important to remember to switch the circuit off when your finished cooking. LP gas is heavier than air. It can quickly accumulate in explosive quantities the bilge if there is a leak. For safety sake, replace this bulb immediately if it burns out.