BoilerFaultCodesVokera Red | On every 0.5 second Fault Code
Also written as REDONEVERY05SECOND — same fault.
The Vokera Red | On every 0.5 second fault code means: your boiler has entered a safety lockout mode due to a critical internal fault or an ignition failure.. It appears on 1 Vokera model in our database.
Technical description: Safety shutdown and/or internal fault
What causes the Vokera Red | On every 0.5 second fault?
This fault occurs when the boiler's control system detects a critical safety issue, most often failing to light the flame after several attempts. It can be caused by a lack of gas reaching the burner, a worn-out spark electrode, or an electrical failure within the main control board. Essentially, the boiler has stopped working to prevent unburnt gas from building up or to protect its internal components from damage.
This issue often surfaces during the first cold snap of autumn when the boiler is pushed to work harder after being idle throughout the summer.
DIY fix possible
Move the mode selector switch to the 'OFF/RESET' position.Wait approximately 10 seconds.Move the switch back to either 'Hot Water Only' or 'Heating and Hot Water' and wait for the boiler to attempt to reignite.
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Gas Safe Register →Vokera models that show the Red | On every 0.5 second fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera Red | On every 0.5 second 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