BoilerFaultCodesVokera E077 Fault Code
The Vokera E077 fault code means: your boiler has detected an issue with the sensor that monitors the water temperature in your main heating circuit, which may prevent your radiators from warming up correctly.. It appears on 4 Vokera models in our database.
Technical description: Main zone water thermostat
What causes the Vokera E077 fault?
This fault occurs when the boiler's internal computer receives an incorrect or missing signal from the sensor responsible for monitoring the heat of the water sent to your radiators. The most common reason is that the sensor has developed a technical fault over time or the electrical connection between the sensor and the main control board has become loose or damaged.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Vokera models that show the E077 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera E077 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