A23 High
Your boiler's internal computer has become confused by its own settings and can no longer communicate correctly with the system.
Technical description: Card parameter error – possibly wrong card parameter setting
Typical repair cost: £120-£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 A23 — no call-out fees, no surprises.
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Parts commonly replaced
- PCB (Main Control Board)
- Display PCB
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