S.25 Low
Your boiler is busy prepping for a heating cycle by checking its internal sensors and clearing the flue, but if it stays stuck on this display, it may be failing to light.
Technical description: Fan and water pump running
Typical repair cost: £0-120 (including labour)
DIY fix possible
Wait 5-10 minutes to see if the boiler progresses to a fire-up sequenceEnsure your thermostat is calling for heat (turned up)Reset the boiler using the button with the flame/cross icon
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 (Wait state)
- Internal Fuse
- Fan
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