BoilerFaultCodesVokera 27 Fault Code
The Vokera 27 fault code means: your boiler has detected an internal electronic communication error or a temporary sensor discrepancy and has paused operation for safety.. It appears on 3 Vokera models in our database.
Technical description: Temporary fault code (Refer to section 7.10)
What causes the Vokera 27 fault?
This fault occurs when the boiler's central control board stops receiving consistent data from its internal sensors or temporary electrical interference disrupts the system. It is often caused by a failing thermistor sending incorrect temperature readings or a maturing circuit board that can no longer process signals reliably. The boiler pauses briefly to prevent overheating or damage until it can verify that all components are communicating correctly.
DIY fix possible
Turn the mode selector knob to the 'OFF/RESET' position.Wait for 30 seconds.Turn the knob back to the 'ON' or 'Winter' position to see if the error clears.
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Gas Safe Register →Vokera models that show the 27 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera 27 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