BoilerFaultCodesVokera 77 Fault Code
The Vokera 77 fault code means: your boiler has detected that the water temperature in your underfloor heating system has become too high and has shut down to protect your pipes and flooring.. It appears on 3 Vokera models in our database.
Technical description: over heat underfloor thermostat ( 2nd CH)
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 77: 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 77 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera 77 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