S.32 High

Vaillant S.32 Fault Code

Also written as S32 — same fault.

The Vaillant S.32 fault code means: your boiler is temporarily pausing because the fan is having trouble reaching or maintaining the correct speed to start the ignition process safely.. It appears on 41 Vaillant models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Waiting time deviation: Fan speed. The waiting period for the fan start-up is activated.

What causes the Vaillant S.32 fault?

This fault occurs when the boiler's control system detects that the fan isn't spinning at the precise speed required to safely clear exhaust gases and bring in fresh air. It is often caused by a failing fan motor, a buildup of debris inside the fan, or a communication issue where the main circuit board cannot correctly read the fan's speed. Because the boiler cannot guarantee a safe combustion process, it temporarily pauses operation until the fan speed stabilizes.

Typical repair cost £180-450 (including labour)

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 S.32 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Vaillant S.32 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 27 April 2026