16 + High

Biasi 16 + Fault Code

Also written as 16 — same fault.

The Biasi 16 + fault code means: your boiler has shut down because the internal exhaust gases have reached a temperature that is dangerously high.. It appears on 4 Biasi models 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: Flue gas overheating detected by NTC.
Typical repair cost £120-350 (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 16 + fault code

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

Source

Biasi 16 + 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