Which of the following is NOT a symptom of a failing boiler?

Consistent high pressure is not typically a symptom of a failing boiler. A well-functioning boiler can maintain a specific pressure range essential for optimal operation. When a boiler operates efficiently, it supports the necessary pressure for steam generation and system functioning.

In contrast, unusual noises, low water levels, and low steam production are common indicators of potential issues within a boiler. Unusual noises may suggest mechanical problems, while low water levels can indicate a risk of overheating or damage to the boiler. Low steam production often points to inefficiencies or operational failures that need addressing to ensure the boiler continues to work correctly. Therefore, recognizing the presence of stable pressure while other symptoms deviate helps in diagnosing boiler health effectively.