Why is my boiler losing pressure?

A boiler losing pressure is a common issue and usually signals a small fault in the system. The most frequent causes include water leaks from pipes, radiators, or valves, bleeding radiators too often, or a faulty pressure relief valve. In some cases, a broken expansion vessel can also lead to pressure loss. Ignoring low pressure can reduce heating efficiency and damage the boiler, so it’s important to identify the cause early and fix it promptly.