Low
d.07 on Vaillant ecoFIT Pure 435

Your boiler is displaying the current temperature setting for your hot water tank rather than a fault code.

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

Set target temperature for the domestic hot water cylinder

From this model's manual
Verified against the Vaillant Ecofit Pure 830 installation & service manual, page 29.
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

Note that 'd.07' is an information code, not a breakdown faultPress the 'Back' or 'Menu' button to return to the main displayAdjust the hot water temperature dial if you wish to change this set point

Find a Gas Safe engineer
Search the official register →

Avoid the next call-out bill

Monthly cover means no unexpected bills when your boiler breaks down.

Approved partner
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Get a quote →

Affiliate links. We may earn a commission at no extra cost to you.

Related fault codes

Related guides you might find useful