How much does it cost to fix Ferroli error code ER 12?

Typical repair cost for the Ferroli ER 12 fault is £180-300 including labour.

ER 12 High

Ferroli ER 12 Fault Code

Q: What does the Ferroli ER 12 fault code mean?

Your boiler has detected a problem with the part that controls the gas supply to the burner, meaning it cannot safely start or maintain a flame for heating or hot water.

Also written as ER12 — same fault.

The Ferroli ER 12 fault code means: your boiler has detected a problem with the part that controls the gas supply to the burner, meaning it cannot safely start or maintain a flame for heating or hot water.. It appears on 1 Ferroli model in our database.

Technical description: FAULT MODUREG - Defective gas valve modulator, No power to Modureg

Typical repair cost £180-300 (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 ER 12 fault code

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

Xignal Repair: £180-300

Source

Ferroli ER 12 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