Ferroli A01 Fault Code (i25 / i29)

Safety disclaimer

Fault code summary

Manufacturer

Ferroli

Fault code

A01

Fault type

Ignition, Gas supply

Severity

lockout

Reset

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

Applicable models

Ferroli i25, Ferroli i29

Quick answer

No burner ignition.

What does this fault code mean?

No burner ignition.

Common causes

• No gas.
• Ignition/detection electrode fault.
• Faulty gas valve.
• Ignition power too low.
• Excessive condensate level.

Symptoms

• The display flashes A01 and the boiler permanently shuts down.

What can the homeowner safely check?

• Check only whether other gas appliances are also affected; do not work on gas components.

Boiler reset information

Ferroli states that A faults cause permanent shutdown and may be restored with the RESET button 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 gas supply, ignition/detection electrode, gas valve and condensate trap.

Applicable boiler models

• Ferroli i25
• Ferroli i29

Related fault codes

• A02 — i25 / i29

  Flame-present signal with the burner off.

  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: A01 — No burner ignition; causes include no gas, electrode fault, faulty gas valve, low ignition power and excessive condensate.

Last verified

2026-09-12

Frequently asked questions