BoilerFaultCodesVokera 30 Fault Code
The Vokera 30 fault code means: your boiler has detected an internal communication failure between its electronic control boards and has shut down for safety.. It appears on 4 Vokera models in our database.
Technical description: Fault code 30 shows (from Fault Finding Test B)
What causes the Vokera 30 fault?
This fault occurs when the boiler's internal computers stop talking to each other, preventing the system from following safe operating instructions. The most common reason is a physical breakdown of the electronic components on the main control board or a loose connection in the wiring that links the display to the engine. Because the boiler cannot confirm its settings are correct, it shuts down completely as a protective measure.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Vokera models that show the 30 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera 30 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 27 April 2026