Vokèra · Vision, Compact A and Unica A-code platform
ACOService operation active
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
- This is normally a status or temporary message rather than a repair instruction.
- Wait for the boiler to complete the operation and consult the user manual if it persists.
How an engineer may fix it
Confirm the operating state and investigate only if it does not clear as described in the appliance instructions.
Some status codes apply only to certain variants. Confirm the exact 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.