How much does it cost to fix Biasi error code cP?

Typical repair cost for the Biasi cP fault is £0 including labour.

cP Low

Biasi cP Fault Code

Q: What does the Biasi cP fault code mean?

Your boiler is currently running at its highest power setting for a professional combustion test and should return to normal operation automatically after a short period.

Also written as CP — same fault.

The Biasi cP fault code means: your boiler is currently running at its highest power setting for a professional combustion test and should return to normal operation automatically after a short period.. It appears on 2 Biasi models in our database.

Technical description: chimney sweep function at maximum output in heating mode

Typical repair cost £0 (including labour)

DIY fix possible

Wait approximately 15 minutes for the test cycle to finish naturally.Try turning the mode selector dial to 'off' or 'reset' and then back to the original position.Restart the boiler by switching the power off at the fused spur and back on again.

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Biasi models that show the cP fault code

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

Source

Biasi cP 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