hP Low

Biasi hP Fault Code

Also written as HP — same fault.

The Biasi hP fault code means: your boiler is currently running a manual test mode to check its performance at the lowest power setting and is not experiencing a functional fault.. It appears on 2 Biasi models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: minimum output in heating mode (Chimney sweep function)
Typical repair cost £0 (including labour)

DIY fix possible

Wait for the chimney sweep test to finish automatically (usually takes 15 minutes)Press the 'Reset' or 'Mode' button to manually exit the test modeTurn the power off and back on again if the code persists

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Biasi models that show the hP fault code

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

Source

Biasi hP 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