BoilerFaultCodesVaillant L.196 Fault Code
Also written as L196 — same fault.
The Vaillant L.196 fault code means: your boiler has detected that the incoming electricity supply is at a dangerously high voltage, so it has shut itself down to protect its internal electronics from being permanently fried.. It appears on 3 Vaillant models in our database.
Technical description: The unit has detected overvoltage in the power supply.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Vaillant models that show the L.196 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vaillant L.196 fault code information on this page is sourced and cross-checked against the official Vaillant service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026