AF2 Medium

Vokera AF2 Fault Code

The Vokera AF2 fault code means: your boiler has detected that the temperature of the water used for your taps and shower has dropped too low and is activating its internal protection mode to prevent freezing.. It appears on 2 Vokera models in our database.

Book a service

This fault should be looked at by a Gas Safe engineer within the next week or two. It may get worse if left.

Technical description: DHW anti-freeze
Typical repair cost £120-250 (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 AF2 fault code

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

Source

Vokera AF2 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