N/A Medium

Biasi N/A Fault Code

Also written as NA — same fault.

The Biasi N/A fault code means: your boiler is struggling to accurately measure the temperature of the water inside the heating system, which usually stops the central heating from working properly.. It appears on 7 Biasi models in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: Faulty c.h. temperature probe NTC
Typical repair cost £100-£200 (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 N/A fault code

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

Source

Biasi N/A 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 31 August 2026