S.23 High
Your boiler is having trouble lighting the flame when you turn on your hot water taps.
Technical description: DHW ignition 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.23 — no call-out fees, no surprises.
*Affiliate links — we may earn a commission at no extra cost to you. Prices shown are starting prices.
Parts commonly replaced
- Ignition electrode
- Flame sensor
- Gas valve
- Spark lead
*Affiliate links — we may earn a commission at no extra cost to you.