How much does it cost to fix Biasi error code Keys fault?

Typical repair cost for the Biasi Keys fault fault is £120-350 including labour.

Keys fault High

Biasi Keys fault Fault Code

Q: What does the Biasi Keys fault fault code mean?

Your boiler's internal computer has detected a problem with its settings or the identification key that tells it how to operate.

Also written as KEYSFAULT — same fault.

The Biasi Keys fault fault code means: your boiler's internal computer has detected a problem with its settings or the identification key that tells it how to operate.. It appears on 1 Biasi model in our database.

Technical description: Keys fault

Typical repair cost £120-350 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Biasi models that show the Keys fault fault code

Click a model for the full fault code list and model-specific repair notes.

Antares System Repair: £120-350

Source

Biasi Keys fault fault code information on this page is sourced and cross-checked against the official Biasi service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026