How much does it cost to fix Biasi error code E35?

Typical repair cost for the Biasi E35 fault is £120-280 including labour.

E35 High

Biasi E35 Fault Code

Q: What does the Biasi E35 fault code mean?

Your boiler is failing to recognise that the flame has ignited, which is preventing the system from heating your water and radiators.

The Biasi E35 fault code means: your boiler is failing to recognise that the flame has ignited, which is preventing the system from heating your water and radiators.. It appears on 3 Biasi models in our database.

Technical description: Flame detection failure

Typical repair cost £120-280 (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 E35 fault code

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

Advance 25C Repair: £100-280
Basica Combi Repair: £120-280
Inovia 2020 Repair: £120-£280

Source

Biasi E35 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