BoilerFaultCodesVokera ON every 0.5-secs Fault Code
Also written as ONEVERY05SECS — same fault.
The Vokera ON every 0.5-secs fault code means: your boiler is signalling a temporary issue, which is often caused by the water pressure being too low or a blockage in the internal air vents.. It appears on 1 Vokera model in our database.
Technical description: Temporary fault (e.g., APS fault, low water pressure)
DIY fix possible
Check the pressure gauge on the front of the boiler; if it is below 1.0 bar, use the filling loop to top it up to 1.5 bar.Turn the boiler off at the mains for 30 seconds and then restart it to see if the fault clears.Ensure your external flue terminal located outside your home is not blocked by debris or leaves.
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Vokera models that show the ON every 0.5-secs fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera ON every 0.5-secs 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