BoilerFaultCodesYour boiler is preparing to heat your home and is checking that water is moving through the pipes before it lights the burner.
This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.
Technical description: Pump running – pre ignition (heating operation)
What causes this fault?
This status occurs when the boiler's internal computer tells the pump to start moving water around your heating system in preparation for ignition. It is a normal part of the startup sequence where the boiler confirms there is sufficient water flow before it safely fires the burner. If the code stays on screen for a long time without the boiler firing, it may indicate that the pump is struggling to move water or the pressure sensor is having difficulty detecting the flow.
DIY fix possible
Check that your external heating controls or thermostat are set to 'On' and a high temperatureEnsure all radiator valves are open to allow water flowWait up to 10 minutes, as this is often a normal part of the boiler's start-up sequence
Find a Gas Safe engineer
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Gas Safe Register →Protect yourself from future repair bills
A boiler cover plan would cover faults like S.2 — no call-out fees, no surprises.
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Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.
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