High
d.33 on Vaillant ecoTEC plus Aquaplus

Your boiler is struggling to operate its internal extraction fan, which prevents the unit from starting the heating or hot water process safely.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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

Required value of the rotary speed of the fan

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Related fault codes

F.32View →F.61View →

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