BoilerFaultCodesVokera 5x Fault Code
Also written as 5X — same fault.
The Vokera 5x fault code means: your boiler's central computer has encountered an internal error and can no longer control the heating or hot water safely.. It appears on 3 Vokera models in our database.
Technical description: Fault codes 5x appear if a problem with the main board exists.
What causes the Vokera 5x fault?
This fault occurs when the boiler’s main control board suffers a critical electronic failure or loses communication with its internal sensors. It is usually caused by age-related degradation of the circuit components or a sudden electrical surge that damages the board's memory. Because the 'brain' can no longer guarantee the boiler is operating safely, it shuts the entire system down as a precaution.
While this can happen at any time, it is slightly more common during stormy weather when power surges or lightning strikes can cause electrical damage to the sensitive circuit board.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Vokera models that show the 5x fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera 5x 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