Low
d.20 on Vaillant ecoFIT Pure 412

Your boiler is simply reporting that it has reached the maximum temperature allowed for your hot water supply and is operating as expected.

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

Maximum hot water set target temperature

Engineer required

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

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