BoilerFaultCodesVokera 28 Fault Code
The Vokera 28 fault code means: your boiler has detected a temporary internal communication error and is attempting to restart itself.. It appears on 3 Vokera models in our database.
Technical description: Temporary fault code (Refer to section 7.10)
What causes the Vokera 28 fault?
This fault occurs when the boiler's internal computer system experiences a temporary glitch in communication between its electronic components. It is most commonly caused by a minor electrical interference or a momentary loss of data signal, which prompts the boiler to automatically reset to ensure everything is working correctly.
DIY fix possible
Wait up to 15 minutes for the boiler to complete its automatic restart sequenceIf the code remains, turn the mode selector switch to the 'OFF/RESET' positionWait 10 seconds, then return the switch to the 'ON' or 'WINTER' positionEnsure any external controls or thermostats are calling for heat
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Gas Safe Register →Vokera models that show the 28 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera 28 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