Boiler repairs
Why does my boiler keep losing pressure?
Common causes of pressure loss, from small leaks to expansion vessel issues, and when to call an engineer.
4 min read
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Pressure loss is a symptom
Repeated pressure loss usually means water is leaving the sealed heating system or a component is not controlling expansion correctly.
Common causes
Small radiator leaks, pipework leaks, pressure relief discharge, expansion vessel faults and recent radiator bleeding can all affect pressure.
What to avoid
Repeatedly topping up the boiler without finding the cause can mask a problem and introduce fresh oxygen into the system, which may encourage corrosion.