BoilerFaultCodesVokera E 51 Fault Code
Also written as E51 — same fault.
The Vokera E 51 fault code means: your boiler has blocked your attempts to restart it because the reset button was pressed too many times in a row.. It appears on 1 Vokera model in our database.
Technical description: Reset key error. The key was pressed more than 5 times. To reset the error cut off the main power.
DIY fix possible
Switch off the power to the boiler using the main isolation switch or fuse spurWait for at least 60 seconds to allow the system to fully power down and clear its memorySwitch the power back on and see if the boiler resumes normal operation
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Vokera models that show the E 51 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera E 51 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 7 July 2026