F.87 High
Your boiler is having trouble creating the spark needed to light the gas or recognizing that a flame has started.
Technical description: Electrodes fault
Typical repair cost: £120-£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 F.87 — no call-out fees, no surprises.
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Parts commonly replaced
- Ignition electrodes
- Flame sensing electrode
- Ignition lead
- PCB
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