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 12 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.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Avoid the next call-out bill
A cover plan would handle faults like E077: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Vokera models that show the E077 fault code
Click a model for the full fault code list and model-specific repair notes.
- Evolve Repair: £90-180
- Evolve S Repair: £150-250
- Pinnacle Combi Repair: £120-250
- Pinnacle System Repair: £120-280
- Synergy Combi Repair: £90-180
- Synergy System Repair: £100-£190
- Unica MAX Repair: £150-250
- Unica MAX Combi Repair: £120-£200
- Unica MAX System Repair: £90-180
- Vision Plus 35C/40C Repair: £150-250
- Vision S Repair: £120-220
- Vision System Sgc Repair: £150-250
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 7 July 2026