How much does it cost to fix Ferroli error code E04?

Typical repair cost for the Ferroli E04 fault is £120-250 including labour.

E04 High

Ferroli E04 Fault Code

Q: What does the Ferroli E04 fault code mean?

Your boiler has detected that the water inside the heating system has become too hot and has automatically shut down to prevent damage.

The Ferroli E04 fault code means: your boiler has detected that the water inside the heating system has become too hot and has automatically shut down to prevent damage.. It appears on 10 Ferroli models in our database.

Technical description: Central heating flow limit thermostat trip

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 E04 fault code

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

Arean Repair: £80-150
Domi Compact
Domina 102 Repair: £80-150
DOMINAplus F24D Repair: £80-150
DOMINAplus F28D Repair: £80-150
Maxima 35 S Repair: £0-80
Modena F Repair: £100-250
Modena HE Repair: £120-250
Optima 201 Repair: £80-150
Xignal Repair: £120-180

Source

Ferroli E04 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