S.11 High
Your boiler is trying to heat your water, but the internal fan responsible for safety cannot get started.
Technical description: DHW mode fan start up error
Typical repair cost: £180-350 (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.11 — no call-out fees, no surprises.
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Parts commonly replaced
- Fan unit
- PCB (Printed Circuit Board)
- Wiring harness
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