F04 High
Your boiler’s internal computer has been set up with the wrong configuration details and cannot operate safely.
Technical description: Wrong card parameter setting
Typical repair cost: £90-180 (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 F04 — no call-out fees, no surprises.
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Parts commonly replaced
- Main PCB (Printed Circuit Board)
- Configuration Key/Param Card
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