BoilerFaultCodesVokera Flashing yellow Fault Code
Also written as FLASHINGYELLOW — same fault.
The Vokera Flashing yellow fault code means: your boiler has detected an issue with the way it is venting or drawing air, which has safely stopped the unit from firing up.. It appears on 1 Vokera model in our database.
Technical description: Air pressure switch fault
What causes the Vokera Flashing yellow fault?
This fault occurs when the boiler's internal safety sensors detect that the fan isn't moving enough air to safely carry away exhaust fumes. The most common reason is a blockage in the flue pipe or a buildup of debris in the small tubes that measure air pressure, which prevents the boiler from firing for your safety.
This issue often crops up during periods of high winds, which can create back-pressure in the flue and interfere with the air pressure switch readings.
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 Flashing yellow fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera Flashing yellow 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