BoilerFaultCodesFerroli A02 Fault Code
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 13 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.
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.
- Arena 30A Repair: £120-250
- Bluehelix HiTech RRT Repair: £120-350
- Bluehelix Pro RRT Repair: £150-300
- Bluehelix Tech Repair: £120-280
- Bluehelix Tech RRT Repair: £120-280
- Bluehelix Tech RRT 24C Repair: £150-300
- Domiproject Repair: £120-£350
- Energy Top B Repair: £150-300
- Extrema C Repair: £150-300
- Force W Repair: £150-300
- i25 Repair: £120-350
- i29 Repair: £120-350
- Modena HE Repair: £120-£350
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.
- Ferroli Arena 30A manual (PDF)
- Ferroli Bluehelix HiTech RRT manual (PDF)
- Ferroli Bluehelix Pro RRT manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026