How much does it cost to fix Biasi error code E99 +?

Typical repair cost for the Biasi E99 + fault is £90-250 including labour.

E99 + High

Biasi E99 + Fault Code

Q: What does the Biasi E99 + fault code mean?

Your boiler’s internal computer has forgotten its settings and does not know which model it is supposed to be, causing it to stop working entirely.

Also written as E99 — same fault.

The Biasi E99 + fault code means: your boiler’s internal computer has forgotten its settings and does not know which model it is supposed to be, causing it to stop working entirely.. It appears on 6 Biasi models in our database.

Technical description: Boiler not configured

Typical repair cost £90-250 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →

Biasi models that show the E99 + fault code

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

Advance 25C Repair: £250-450
Antares Combi Repair: £250-450
Antares System Repair: £180-450
Inovia 2020 Repair: £80-160
Inovia 2020 Repair: £90-250
Rinnova Adaptive Combi Repair: £280-450

Source

Biasi E99 + 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