How much does it cost to fix Ferroli error code E03?

Typical repair cost for the Ferroli E03 fault is £120-250 including labour.

E03 Emergency

Ferroli E03 Fault Code

Q: What does the Ferroli E03 fault code mean?

Your boiler has detected that the flue gases are not being cleared away safely or the air intake is blocked, so it has shut itself down to prevent dangerous fumes from building up.

The Ferroli E03 fault code means: your boiler has detected that the flue gases are not being cleared away safely or the air intake is blocked, so it has shut itself down to prevent dangerous fumes from building up.. It appears on 9 Ferroli models in our database.

Technical description: Fault code if they should occur (see page 27 troubleshooting)

Typical repair cost £120-250 (including labour)

Engineer required

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

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Ferroli models that show the E03 fault code

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

Source

Ferroli E03 fault code information on this page is sourced and cross-checked against the official Ferroli service / installation manuals for each affected model.

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