What is indicated by a faulty pressure gauge in a boiler?

A faulty pressure gauge in a boiler indicates inaccurate pressure readings. Pressure gauges are critical components in boiler systems, providing necessary data for safe and efficient operation. If the gauge is faulty, it can lead to incorrect information being displayed about the pressure within the boiler. This misinformation can result in improper operational decisions, such as running the boiler at too high or too low a pressure, potentially leading to safety hazards or inefficient performance.

The other options do not correctly represent the implications of a faulty pressure gauge. For instance, safety systems being operational would typically depend on accurate readings to assess the condition of the boiler, whereas excess water in the boiler is not directly related to the functionality of the pressure gauge. Similarly, proper heating efficiency is contingent upon accurate readings that guide the boiler's operation, which would be compromised by a faulty gauge. Thus, understanding the implications of an inaccurate pressure reading is crucial for maintaining boiler safety and efficiency.