228 V High
Your boiler thinks it can see a flame even though it hasn't started the ignition process yet, which prevents it from running for safety reasons.
Technical description: Flame signal without flame present – air/gas ratio control valve may need replacing as might the ionisation cable
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 228 V — no call-out fees, no surprises.
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Parts commonly replaced
- Ionisation electrode
- Gas valve
- Detection cable
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