Low
S.16 on Vaillant ecoTEC

Your boiler is simply cooling itself down by running the internal fan for a few moments after it has finished heating, which is a normal part of the shutdown process.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description

Fan over run

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Related fault codes

S.0View →S.7View →

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