E77 High

Vokera E77 Fault Code

The Vokera E77 fault code means: your boiler is struggling because it is not receiving the correct amount of electrical power, which is causing it to shut down for protection.. It appears on 1 Vokera model 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: Low voltage fault
Typical repair cost £150-300 (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 E77 fault code

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

Source

Vokera E77 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