How much does it cost to fix Vokera error code A90?

Typical repair cost for the Vokera A90 fault is £150-250 including labour.

A90 High

Vokera A90 Fault Code

Q: What does the Vokera A90 fault code mean?

Your boiler has detected that the water inside the system is getting much hotter than it should be, so it has shut itself down to prevent damage.

The Vokera A90 fault code means: your boiler has detected that the water inside the system is getting much hotter than it should be, so it has shut itself down to prevent damage.. It appears on 3 Vokera models in our database.

Technical description: Flow sensor overtemperature

Typical repair cost £150-250 (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 A90 fault code

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

Source

Vokera A90 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