Vokèra · Vision, Compact A and Unica A-code platform
A11False flame detected on Compact A, Unica and some other A-code variants — not listed on Vision 25C/30C
This code applies to Vision 25C, Vision 30C, Compact A, Unica 28i, Unica 32i. Fault codes narrow down the likely problem, but they do not replace a model-specific diagnosis.
What you can safely check
- Do not keep resetting the boiler or open its case.
- Arrange a Gas Safe registered engineer.
- If you smell gas, leave the property and call the National Gas Emergency Service on 0800 111 999 from outside.
How an engineer may fix it
Isolate and test the gas valve circuit, valve tightness, ignition or flame-sensing system and control board; repair or replace components and complete required gas-safety checks.
A11 is not in the Vision 25C/30C fault table. Confirm the exact Compact A, Unica or other A-code user manual.
Manufacturer source: Vokèra — Vision Combi 25C/30C User, Installation and Servicing Manual. Checked 15 August 2026. The appliance manual and an engineer’s on-site diagnosis take precedence. Never remove the boiler case yourself.