Verified boiler fault code
Alpha 38 Fault Code (Evoke 28 and 33)
Loss of flame rectification.
Safety disclaimer
Fault code summary
- Manufacturer
- Alpha
- Fault code
- 38
- Fault type
- Flame failure, Gas supply, Flue
- Severity
- high
- Reset
- Not specified
- Applicable models
- Evoke 28, Evoke 33
Quick answer
Loss of flame rectification.
What does this fault code mean?
Loss of flame rectification.
Common causes
- Flame detected but signal lost.
- Flame-sensing electrode/lead, flue-gas recirculation, gas valve, flue, gas supply, combustion setting or burner earth issue.
Symptoms
- Ignition retries after fan purge.
What can the homeowner safely check?
- Check whether other gas appliances work and whether gas is available; combustion and flue checks are for a qualified engineer.
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 flame sensing, flue, gas supply, gas valve and combustion by a qualified engineer.
Applicable boiler models
Related fault codes
- 01 — Evoke 28 and 33
Ignition failure; flame not detected during the ignition sequence.
Read fault code - 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
Manufacturer documentation
Alpha Evoke installation and servicing instructions38 | Loss of flame rectification | Flame detected but signal lost. Ignition retries after fan purge | Check flame sensing electrode and lead; flue gas recirculation; gas valve; flue system; gas supply; combustion settings; burner earth
Last verified
2026-09-12
Frequently asked questions
What does Alpha 38 mean?
Loss of flame rectification.