ACO Low

Vokera ACO Fault Code

The Vokera ACO fault code means: your boiler has reached its programmed time for a routine annual safety service and is alerting you that maintenance is now due.. It appears on 3 Vokera models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Service operation
Typical repair cost £90-140 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Vokera models that show the ACO fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Vokera ACO fault code information on this page is sourced and cross-checked against the official Vokera service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026