Low
d.05 on Vaillant ecoTEC Plus 630

The d.05 code is not actually an error; it is a normal status message showing the temperature your boiler is currently aiming to reach for your radiators.

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

Determined heating flow set target temperature: Current value

DIY fix possible

No action requiredThis is a status code confirming your boiler is operating normallyPress the 'i' button on the front panel to return to the standard display

Find a Gas Safe engineer
Search the official register →

Related guides you might find useful

Radiators cold at the bottom

Sludge build-up — needs flushing, not bleeding.

Read →

Yellow or orange flame — CO safety

Safety-critical — turn off, read this.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →