Low
d.00 on Vaillant ecoTEC plus System

Your boiler is simply displaying its current power setting and is operating normally.

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

Heating maximum output: The maximum heating output varies depending on the product. Automatic: Unit automatically adjusts the maximum output to the current system demand

Engineer required

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

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