How much does it cost to fix Biasi error code Er 11?

Typical repair cost for the Biasi Er 11 fault is £100-280 including labour.

Er 11 High

Biasi Er 11 Fault Code

Q: What does the Biasi Er 11 fault code mean?

Your boiler is failing to detect a flame, which means it cannot light safely to provide heating or hot water.

Also written as ER11 — same fault.

The Biasi Er 11 fault code means: your boiler is failing to detect a flame, which means it cannot light safely to provide heating or hot water.. It appears on 1 Biasi model in our database.

Technical description: Flame detection error

Typical repair cost £100-280 (including labour)

DIY fix possible

Check if other gas appliances (like a hob) are working to ensure gas is reaching the property.Ensure your gas meter has credit if you use a pre-payment meter.Gently press the 'Reset' button on the front control panel to see if the boiler restarts.

Find a Gas Safe engineer

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

Gas Safe Register →

Biasi models that show the Er 11 fault code

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

Advance 25C Repair: £100-280

Source

Biasi Er 11 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