BoilerFaultCodesBiasi 30c Fault Code
Also written as 30C — same fault.
The Biasi 30c fault code means: your boiler has likely detected a problem with the temperature sensor or its wiring, meaning it cannot accurately gauge how hot the water is.. It appears on 4 Biasi models in our database.
Technical description: N/A
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 30c fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Biasi 30c 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