BoilerFaultCodesVaillant L.032 Fault Code
Also written as L032 — same fault.
The Vaillant L.032 fault code means: your boiler is struggling to accurately detect the flow of water circulating through your heating system, which means it may prevent the heating or hot water from turning on to protect itself.. It appears on 3 Vaillant models in our database.
Technical description: Thevolumeflowsensorisdefectiveorthesignalisnotplausible.
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.032 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vaillant L.032 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