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Energy r 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 Information
Wiring diagrams
Fault Codes
For a full list of fault codes with recommended checks, click here.
D Codes
Click here to view other Glow-worm self-help videos on the Glow-worm Youtube channel.
S Codes
Click here to view other Glow-worm self-help videos on the Glow-worm Youtube channel.
Test Codes
To access the Service Codes, Press and hold the “Power” button, when the Reset symbol appears press and hold “mode” and release “power”.
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. By providing information in the help centre, 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.