Which component is responsible for monitoring the proper flow of gas to the burner?

The component responsible for monitoring the proper flow of gas to the burner is the flame sensor. The flame sensor detects whether a flame is present, which is an indicator that gas is being ignited and flowing correctly. If the flame sensor does not detect a flame, it can indicate that there is a problem, potentially leading to a gas shutoff for safety reasons. This ensures that gas is not flowing when there is no flame to use it, thereby preventing dangerous situations such as gas leaks or explosions.

The other components mentioned serve different functions. The gas relief valve is designed to vent excess pressure from the system to prevent overpressure situations, while the pressure regulator controls the pressure of gas being supplied to the burner, ensuring it remains within a safe range. The ignition electrode is responsible for igniting the gas when it is released, not monitoring its flow. Each of these components plays a crucial role in the overall operation of gas appliances, but it is the flame sensor that specifically monitors the presence of a flame to confirm that gas is flowing appropriately.