Which of the following is a sign of a potential problem with a float-operated boiler supply valve?

• A. Low water pressure
• B. Unusual noises
• C. Scale buildup
• D. Inconsistent temperature

Answer: (C)

A sign of a potential problem with a float-operated boiler supply valve is scale buildup. When scale accumulates inside or around the valve, it indicates that there may be issues with water quality or temperature regulation. This buildup can restrict the flow of water or interfere with the functionality of the valve itself, potentially leading to improper operation of the boiler.

In contrast, low water pressure is a broader indication of system issues that may not be directly tied to the supply valve, while unusual noises could arise from various system components and aren't solely indicative of a problem with the valve. Inconsistent temperature can also stem from multiple issues within the boiler system, including but not limited to the valve and its operation. Thus, scale buildup is a direct sign of potential malfunction specific to the float-operated boiler supply valve.