If a Steam Boiler Burner is operational and the Water Gauge glass shows no water, what is the immediate action required?

In the scenario where a steam boiler burner is operational but the water gauge glass shows no water, the immediate action required is to shut off the fuel supply. This is crucial for safety reasons. A lack of water in the boiler can lead to overheating and potential damage to the boiler or even cause a dangerous failure, such as a boiler explosion.

Shutting off the fuel supply prevents the burner from continuing to operate without water, which could create hazardous conditions. This action should be taken as a priority because it addresses the critical issue of insufficient water, which is necessary for safe and efficient boiler operation.

The other options, while they might seem relevant in different contexts, do not address the immediate and dangerous situation created by the absence of water in the boiler. Taking action to open the water supply valve or increase the temperature setting does not resolve the potential risks associated with operating the burner without water. Checking the pressure gauge might provide additional information, but it does not directly mitigate the immediate danger of continuing to run the burner under such conditions.