E021 High

Vokera E021 Fault Code

The Vokera E021 fault code means: your boiler has detected an internal electronic or mechanical failure with the component that controls the gas supply, meaning it cannot ignite safely for heating or hot water.. It appears on 9 Vokera models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: GAS VALVE CONTROL MALFUNCTION
Typical repair cost £180-350 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Vokera models that show the E021 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Vokera E021 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