BoilerFaultCodesTechnical description
Pump overrun time after warm start
What causes this fault?
This occurs when the boiler has finished pre-heating its internal components and needs to circulate water to prevent heat from building up too much in one spot. It is a normal safety function designed to protect the internal heat exchanger from overheating after the burner switches off. Think of it as the boiler taking a 'cool down' breath to ensure everything remains at a stable temperature.
DIY fix possible
Check that your radiator valves are open to allow water to circulateMonitor the boiler for a few minutes as this is often a normal operational status rather than a faultEnsure there is no air trapped in the system by bleeding a radiator
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