S.25 Low
Your boiler is temporarily cooling itself down after finishing a cycle for hot water.
Technical description: DHW mode – pump or fan overrun error
Typical repair cost: £0-80 (including labour)
DIY fix possible
Check that at least one radiator or bypass valve is open to allow heat to dissipateWait for the code to disappear naturally as the boiler settlesEnsure there is enough water pressure shown on the digital display (1.0 to 1.5 bar)
Protect yourself from future repair bills
A boiler cover plan would cover faults like S.25 — no call-out fees, no surprises.
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Parts commonly replaced
- None (Normal operation)
- Pump (if code persists)
- Diverter Valve
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