How much does it cost to fix Biasi error code Operation lights flashing?

Typical repair cost for the Biasi Operation lights flashing fault is £100-280 including labour.

Operation lights flashing High

Biasi Operation lights flashing Fault Code

Q: What does the Biasi Operation lights flashing fault code mean?

Your boiler is starting up briefly but then switching itself off because it is struggling to safely expel waste gases or drain excess condensation.

Also written as OPERATIONLIGHTSFLASHING — same fault.

The Biasi Operation lights flashing fault code means: your boiler is starting up briefly but then switching itself off because it is struggling to safely expel waste gases or drain excess condensation.. It appears on 1 Biasi model in our database.

Technical description: The boiler lights for a short while in c.h. mode (Condensate drain pipe and trap / Air pressure sensor / Flue pipes defect).

Typical repair cost £100-280 (including labour)

DIY fix possible

Check the white plastic condensate pipe outside for signs of freezing or blockagesThaw a frozen external pipe using warm (not boiling) water or a heat packEnsure the external flue terminal is not obstructed by debris, snow, or vegetation

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Biasi models that show the Operation lights flashing fault code

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

Riva Compact HE M96a Repair: £100-280

Source

Biasi Operation lights flashing 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