_St Medium

Vokera _St Fault Code

Also written as ST — same fault.

The Vokera _St fault code means: your boiler is currently undergoing an automatic safety shutdown process, usually because the water temperature has risen too quickly or the system is waiting for the pump to move heat away.. It appears on 3 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: AUTOSTOP
Typical repair cost £100-250 (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 _St fault code

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

Source

Vokera _St 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