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ecoTEC plus 400 series (2016 - Present) Engineer Support

Welcome to the Engineer Technical Support section. Please use the different sections below to find answers to your technical questions. You can also find a range of useful contact numbers, including Technical support, here.

Fault Finding Sections

Wiring Diagram

Technical Information

Roomstat Connection

D Codes

Fault Codes

P Codes

Status codes

Available Literature

ecoTEC plus 400 series Installation Manual ecoTEC plus 400 series User Manual ecoTEC plus 400 Brochure

Disclaimer: Whilst every attempt is made to ensure the accuracy of information contained on this help centre, errors can occasionally occur. The Vaillant Group cannot accept any responsibility for any reliance upon such information, any omissions or any subsequent loss or damage.Vaillant Group recommends that only qualified, gas safe registered engineers carry out repairs, installation or servicing.Vaillant Group reserves the right to amend , update, or withdraw any information within the help centre without prior notice.

All Images and content in this help centre is a copyright of Vaillant and must not be reproduced without the express permission of Vaillant Group. Such permission may be obtained by emailing servicevisit@vaillant.com with details of proposed usage.

Gas safe register is a registered trademark of the HSE and is used under license.