How much does it cost to fix Worcester Bosch error code Incorrect CO2?

Typical repair cost for the Worcester Bosch Incorrect CO2 fault is £150-350 including labour.

Incorrect CO2 Emergency

Worcester Bosch Incorrect CO2 Fault Code

Q: What does the Worcester Bosch Incorrect CO2 fault code mean?

Your boiler is struggling to mix the right amount of air with its fuel to burn cleanly, which means it may not operate safely or efficiently.

Also written as INCORRECTCO2 — same fault.

The Worcester Bosch Incorrect CO2 fault code means: your boiler is struggling to mix the right amount of air with its fuel to burn cleanly, which means it may not operate safely or efficiently.. It appears on 7 Worcester Bosch models in our database.

Technical description: Air adjustment fault; Oil pressure incorrect

Typical repair cost £150-350 (including labour)

Engineer required

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

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Worcester Bosch models that show the Incorrect CO2 fault code

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

Source

Worcester Bosch Incorrect CO2 fault code information on this page is sourced and cross-checked against the official Worcester Bosch service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026