Li01 High

Biasi Li01 Fault Code

Also written as LI01 — same fault.

The Biasi Li01 fault code means: your boiler has shut down because it grew too hot while trying to heat your water, usually due to poor water flow through the system.. It appears on 1 Biasi model in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Primary circuit temperature limit during d.h.w. operation
Typical repair cost £120-280 (including labour)

DIY fix possible

Check that all radiator valves are fully openEnsure your boiler pressure is between 1.0 and 1.5 barReset the boiler by turning the control knob to 'R' for five seconds

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Biasi models that show the Li01 fault code

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

Source

Biasi Li01 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 7 July 2026