S.46 Medium
Your boiler is struggling to keep a steady flame when it is running at its lowest power setting, causing it to operate in a restricted safety mode.
Technical description: Comfort safety mode flame loss at minimum load
Typical repair cost: £100-£250 (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.46 — no call-out fees, no surprises.
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Parts commonly replaced
- Ionisation electrode
- Ignition lead
- Gas valve
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