BoilerFaultCodesVokera E34 Fault Code
The Vokera E34 fault code means: your boiler has detected an issue with the electrical power supply coming from the grid or your home's wiring, meaning the electricity frequency is incorrect for it to operate safely.. It appears on 1 Vokera model in our database.
Technical description: 50 Hz ERROR The mains frequency is not 50 Hz
What causes the Vokera E34 fault?
This fault occurs when the boiler's internal sensors detect that the incoming electrical supply is not stable enough to run the electronic components safely. The most common reasons are fluctuations in the National Grid supply or issues with your home’s electrical wiring, though it can also be triggered if the boiler’s main control board has developed a fault and is misreading the power signal.
This fault is more common during periods of extreme weather, such as heavy storms or heatwaves, which can put the local electrical grid under stress and cause supply instability.
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 E34 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera E34 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