BoilerFaultCodesVokera Green LED on every 0.5 seconds Fault Code
Also written as GREENLEDONEVERY05SECONDS — same fault.
The Vokera Green LED on every 0.5 seconds fault code means: your boiler has paused because the water pressure is likely too low or it is struggling to clear air from the system.. It appears on 2 Vokera models in our database.
Technical description: Temporary fault — air pressure switch fault or low system water pressure; check pressure 1–1.5 bar
DIY fix possible
Check the pressure gauge on the front of the boiler.If the needle is below 1 bar, use the filling loop valves underneath to top up the system to 1.5 bar.Ensure the black plastic taps are closed tight after filling and restart the boiler.
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Vokera models that show the Green LED on every 0.5 seconds fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera Green LED on every 0.5 seconds 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