Guide
Boiler pressure that sits too low can reduce heating performance, while overly high pressure can trigger safety mechanisms and shutdowns.
Pressure changes should be viewed in context: cold pressure, heated pressure, and how quickly values shift across normal operation.
Short-term correction may restore function, but repeated instability often points to expansion vessel issues, small leaks, or valve faults.
Engineers can inspect system integrity, pressure relief function, and component behaviour to identify the root cause rather than symptoms.
Maintaining stable pressure improves reliability, lowers lockout risk, and supports more consistent heat delivery across the home.
Keep a note of readings over time to help diagnosis, especially if pressure loss appears intermittent.