Low
S.96 on Vaillant ecoTEC plus System

Your boiler is currently running a brief internal self-check and has temporarily paused your heating and hot water to complete it.

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

Automatic test programme: Return temperature sensor, heating and hot water request blocked.

Engineer required

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

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Related fault codes

F.22View →F.73View →

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