A24 High
Your boiler’s internal computer has become confused by its own settings and doesn't know how to operate correctly.
Technical description: Card parameter error – possibly wrong card parameter setting
Typical repair cost: £100-£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 A24 — no call-out fees, no surprises.
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Parts commonly replaced
- Electronic Control Board (PCB)
- Parameter Configuration Chip
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