B7 257 High
Your boiler's internal computer has encountered a critical communication error and cannot operate safely.
Technical description: Internal error – possible control board problem
Typical repair cost: £280-550 (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 B7 257 — no call-out fees, no surprises.
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Parts commonly replaced
- Main Printed Circuit Board (PCB)
- Control Box
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