Alpha 01 Fault Code (Evoke 28 and 33)

Safety disclaimer

Fault code summary

Manufacturer

Alpha

Fault code

01

Fault type

Ignition, Flame failure, Gas supply

Severity

high

Reset

Not specified

Applicable models

Evoke 28, Evoke 33

Quick answer

Ignition failure; flame not detected during the ignition sequence.

What does this fault code mean?

Ignition failure; flame not detected during the ignition sequence.

Common causes

• Gas supply.
• Ignition/sensing electrode, ignition generator or lead, gas valve, PCB/wiring, or flue restriction.

Symptoms

• Flame is not detected during ignition.

What can the homeowner safely check?

• Check only whether other gas appliances work and whether the gas supply is on; do not work on the boiler.

Boiler reset information

Reset information was not provided in the verified manufacturer source. Do not repeatedly reset an unresolved fault.

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/flame sensing, gas valve, PCB wiring and flue.

Applicable boiler models

• Evoke 28
• Evoke 33

Related fault codes

• 02 — Evoke 28 and 33

  Overheat boiler lockout.

  Read fault code
• 03 — Evoke 28 and 33

  High flue temperature.

  Read fault code
• 04 — Evoke 28 and 33

  Gas-valve electrical connection fault.

  Read fault code
• 05 — Evoke 28 and 33

  CH flow sensor fault.

  Read fault code
• 06 — Evoke 28 and 33

  DHW sensor fault.

  Read fault code
• 08 — Evoke 28 and 33

  Maximum number of resets reached (five).

  Read fault code
• 10 — Evoke 28 and 33

  Primary system pressure low.

  Read fault code
• 16 — Evoke 28 and 33

  Fan fault.

  Read fault code

Manufacturer documentation

01 | Ignition failure | Flame not detected during ignition sequence | Gas supply; check ignition/sensing electrode; ignition generator or lead; gas valve operation; PCB and wire connections; flue restriction or blockage

Last verified

2026-09-12

Frequently asked questions