BoilerFaultCodesVokera E01 Fault Code
The Vokera E01 fault code means: your boiler is unable to light the gas flame needed to heat your home or water.. It appears on 6 Vokera models in our database.
Technical description: Ignition failure
What causes the Vokera E01 fault?
This fault occurs when the boiler attempts to start up but cannot establish or detect a flame. The most common reasons include a lack of gas reaching the unit, a worn-out electrode that can no longer create a spark, or a build-up of carbon that prevents the sensor from 'seeing' the flame. It can also be caused by an internal electronic failure where the boiler's computer fails to open the gas valve correctly.
This fault is more common in winter, as extremely cold temperatures can cause external gas regulators to freeze or condensation pipes to block, both of which prevent successful ignition.
DIY fix possible
Check that your gas supply is turned on at the meterCheck if other gas appliances (like a hob) are workingPress the Reset button on the boiler control panelEnsure your condensate pipe has not frozen if it is very cold outside
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Gas Safe Register →Vokera models that show the E01 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera E01 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