F.88 High
Your boiler is struggling to keep a steady flame lit, causing it to shut down for safety.
Technical description: Unstable flame (analogue input), underfloor heating contact or gas valve fault
Typical repair cost: £150-350 (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 F.88 — no call-out fees, no surprises.
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Parts commonly replaced
- Gas valve
- Ignition lead
- Flame sensing electrode
- Printed Circuit Board (PCB)
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