BoilerFaultCodesVokera 31 Fault Code
The Vokera 31 fault code means: your boiler is experiencing a communication or configuration error between internal electronic boards that prevents it from starting correctly.. It appears on 3 Vokera models in our database.
Technical description: Temporary fault code (Refer to section 7.10)
What causes the Vokera 31 fault?
This fault occurs when the boiler's internal electronic brains stop speaking to each other. The most common reason is a communication failure between the main control board and the display panel, often caused by a loose wire or a failing circuit component. Because the two boards cannot confirm the boiler's safety settings, the system shuts down as a precaution.
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 31 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera 31 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