Low
d.25 on Vaillant ecoFIT Pure 418

Your boiler is currently busy heating your hot water cylinder or keeping its internal water warm so you get hot water quickly.

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.

What the manual says

Manufacturer manual

Status of the requirement to reheat the cylinder or for the hot water warm start from the eBUS thermostat

From this model's manual
Verified against the Vaillant Ecofit Pure 830 installation & service manual, page 30.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

No action is required as this is a status message, not a fault.Wait for the boiler to finish heating the water tank.Check your thermostat or timer settings if the boiler stays in this mode longer than expected.

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