S.24 High
Your boiler is struggling to keep the flame lit while trying to heat your tap water, which usually means the system is cutting out during use.
Technical description: DHW mode – burner error
Typical repair cost: £120-£350 (including labour)
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Protect yourself from future repair bills
A boiler cover plan would cover faults like S.24 — no call-out fees, no surprises.
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Parts commonly replaced
- Gas valve
- Ignition lead
- Electrode
- Burner gasket
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