Ferroli A02 Fault Code (i25 / i29)

Safety disclaimer

Fault code summary

Manufacturer

Ferroli

Fault code

A02

Fault type

Flame detection, Safety lockout

Severity

lockout

Reset

Ferroli states that A faults cause permanent shutdown and may be restored with RESET only after the fault is eliminated.

Applicable models

Ferroli i25, Ferroli i29

Quick answer

Flame-present signal with the burner off.

What does this fault code mean?

Flame-present signal with the burner off.

Common causes

• Electrode fault.
• Card fault.

Symptoms

• The display flashes A02 and the boiler permanently shuts down.

What can the homeowner safely check?

• Record the code and contact a qualified engineer.

Boiler reset information

Ferroli states that A faults cause permanent shutdown and may be restored with RESET only after the fault is eliminated.

When should I call an engineer?

Contact a suitably qualified heating engineer when the fault persists, the boiler locks out, or the manufacturer instructions do not resolve it. For gas appliance work in the UK, use a Gas Safe registered engineer.

Engineer diagnosis

• Investigate ionisation electrode wiring and the control card.

Applicable boiler models

• Ferroli i25
• Ferroli i29

Related fault codes

• A01 — i25 / i29

  No burner ignition.

  Read fault code
• A03 — i25 / i29

  Overtemperature protection intervention.

  Read fault code
• A06 — i25 / i29

  No flame after the ignition phase.

  Read fault code
• A09 — i25 / i29

  Gas-valve fault.

  Read fault code
• A15 — i25 / i29

  Air-pressure-switch fault F05 generated five times in the last 24 hours.

  Read fault code
• A16 — i25 / i29

  Gas-valve fault.

  Read fault code
• A23 — i25 / i29

  Card parameter fault.

  Read fault code
• A24 — i25 / i29

  Card parameter fault.

  Read fault code

Manufacturer documentation

Table 9: A02 — Flame present signal with burner off; possible electrode or card fault.

Last verified

2026-09-12

Frequently asked questions