BoilerFaultCodesVokera E086 Fault Code
The Vokera E086 fault code means: your boiler has detected a blockage in the flue pipe that is preventing waste gases from safely exiting your home.. It appears on 4 Vokera models in our database.
Technical description: Obstruction fumes alarm
What causes the Vokera E086 fault?
This fault occurs when the boiler's internal sensors detect that harmful exhaust gases are not able to leave the building freely. The most common reasons are a physical obstruction in the flue pipe, such as a bird's nest or debris, or a mechanical failure in the fan that pushes the air out.
This fault is more frequent during autumn and winter when falling leaves or nesting birds are more likely to block the external vent.
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 E086 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera E086 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