Which of the following is NOT a function of the LWCO?

The function of a Low Water Cut-Off (LWCO) is primarily to ensure the safe operation of a boiler by monitoring and controlling the water level. This device plays a crucial role in preventing overheating by shutting down the burner when the water level falls below a certain threshold. Therefore, preventing overheating, ensuring adequate water levels, and notifying operators of low water levels are indeed functions of the LWCO.

On the other hand, controlling the fuel supply is not a function of the LWCO. While the LWCO can influence the operation of other system components—such as shutting down the burner when low water conditions are detected—it does not directly control the fuel supply itself. The fuel supply is typically managed by other controls within the boiler system, which are separate from the functions provided by the LWCO. This distinction highlights why controlling fuel supply is not a function attributed to the LWCO.