BoilerFaultCodesYour boiler’s internal computer has become confused by its own settings and doesn't know how to operate correctly.
Book a Gas Safe engineer within 24–48 hours. Your boiler may be unsafe or could break down completely if left.
Technical description: Card parameter error – possibly wrong card parameter setting
What causes this fault?
This fault occurs when the boiler's main control board loses its identity or holds incorrect software instructions for your specific model. The most common reason is a memory error on the circuit board or a mismatch between the software chip and the hardware after a repair.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
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A boiler cover plan would cover faults like A24 — no call-out fees, no surprises.
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Could it be time for a new boiler?
If repair costs are adding up, a new energy-efficient boiler could be the smarter long-term choice.
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