AF1 Low

Vokera AF1 Fault Code

The Vokera AF1 fault code means: your boiler has detected that the temperature is dropping very low and has activated its internal frost protection mode to prevent the water inside from freezing.. It appears on 2 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: heating anti-freeze

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 AF1 fault code

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

Source

Vokera AF1 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