BoilerFaultCodesVokera Fault light is on Fault Code
Also written as FAULTLIGHTISON — same fault.
The Vokera Fault light is on fault code means: your boiler has detected a general internal error and has locked itself out for safety, meaning your heating and hot water will not work until it is reset or repaired.. It appears on 1 Vokera model in our database.
Technical description: The appliance has detected a fault (refer to manual section 3.3)
What causes the Vokera Fault light is on fault?
This fault occurs when the boiler's internal computer detects an inconsistency in the ignition process or a failure in one of its safety sensors. The most common reasons are that the boiler is struggling to generate a spark to light the gas, or a faulty sensor is sending incorrect temperature readings to the main control board.
DIY fix possible
Check if your gas prepay meter has creditRotate the mode selector switch to the 'OFF/RESET' position, wait five seconds, then move it back to 'Auto' or 'Hot Water Only'Check your pressure gauge is between 1 and 1.5 bar; if it is too low, top it up using the filling loop
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Gas Safe Register →Vokera models that show the Fault light is on fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera Fault light is on 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