How much does it cost to fix Biasi error code 1 +?

Typical repair cost for the Biasi 1 + fault is £90-280 including labour.

1 + High

Biasi 1 + Fault Code

Q: What does the Biasi 1 + fault code mean?

Your boiler has failed to light because it cannot detect a flame, meaning you have no heating or hot water until it is reset or repaired.

Also written as 1 — same fault.

The Biasi 1 + fault code means: your boiler has failed to light because it cannot detect a flame, meaning you have no heating or hot water until it is reset or repaired.. It appears on 2 Biasi models in our database.

Technical description: to failed ignition.

Typical repair cost £90-280 (including labour)

DIY fix possible

Verify that your gas supply is turned on (check other gas appliances like a hob).Press the 'Reset' button on the front of the boiler once.Ensure there has not been a credit outage on your gas meter if you have a pre-payment system.

Find a Gas Safe engineer

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

Gas Safe Register →

Biasi models that show the 1 + fault code

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

Source

Biasi 1 + 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