How much does it cost to fix Ferroli error code A02?

Typical repair cost for the Ferroli A02 fault is £120-£350 including labour.

A02 High

Ferroli A02 Fault Code

Q: What does the Ferroli A02 fault code mean?

Your boiler thinks it sees a flame even though it hasn't started the burner yet, which is a safety conflict that prevents it from running.

The Ferroli A02 fault code means: your boiler thinks it sees a flame even though it hasn't started the burner yet, which is a safety conflict that prevents it from running.. It appears on 12 Ferroli models in our database.

Technical description: Flame detected with the burner off – electrode defective main board defective

What causes the Ferroli A02 fault?

This fault occurs when the boiler's internal sensor detects an electrical signal mimicking a flame before the heating cycle has actually started. This is usually caused by a carbon-coated or damaged electrode sending a 'false' signal, or moisture and debris on the burner assembly interfering with the detection system.

Typical repair cost £120-£350 (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 A02 fault code

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

Source

Ferroli A02 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