Alpha 01 Fault Code (E-Tec 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

E-Tec 28, E-Tec 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

• E-Tec 28
• E-Tec 33

Related fault codes

• 02 — E-Tec 28 and 33

  Overheat boiler lockout.

  Read fault code
• 03 — E-Tec 28 and 33

  High flue temperature.

  Read fault code
• 04 — E-Tec 28 and 33

  Gas-valve electrical connection fault.

  Read fault code
• 05 — E-Tec 28 and 33

  CH flow sensor fault.

  Read fault code
• 06 — E-Tec 28 and 33

  DHW sensor fault.

  Read fault code
• 08 — E-Tec 28 and 33

  Maximum number of resets reached (five).

  Read fault code
• 10 — E-Tec 28 and 33

  Primary system pressure low.

  Read fault code
• 16 — E-Tec 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