S.14 Medium
Your boiler is confused and thinks you are asking for hot water even though your taps are turned off, preventing the heating from starting.
Technical description: Hot water demand via fan sensor error
Typical repair cost: £100-220 (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.14 — no call-out fees, no surprises.
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Parts commonly replaced
- Diverter Valve
- Hall Effect Sensor
- Aqua Sensor
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