BoilerFaultCodesVokera 81 Fault Code
The Vokera 81 fault code means: your boiler has identified an internal sensor or communication error that is preventing it from running properly.. It appears on 3 Vokera models in our database.
Technical description: Temporary fault code (Refer to section 7.10)
What causes the Vokera 81 fault?
This fault occurs when the boiler's main control board loses reliable communication with its internal sensors or fails to read the temperature data correctly. The most common reason is an electronic glitch or a failing main circuit board that can no longer process signals from the thermistors. In some cases, it can also be triggered by a faulty sensor sending an unstable voltage back to the control centre.
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 →Vokera models that show the 81 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera 81 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