B1 High
Your boiler's computer memory chip is loose or missing, meaning the system doesn't know which model it is and has stopped working for safety.
Technical description: Code plug not detected .
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 B1 — no call-out fees, no surprises.
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Parts commonly replaced
- Code plug
- Printed Circuit Board (PCB)
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