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![Vaillant ecoFIT pure 412 [5/16] 3.2.1 Operator control panel](https://mans.io/views2/1492988/page5/bg5.png "Vaillant ecoFIT pure 412 [5/16] 3.2.1 Operator control panel")
Vaillant ecoFIT pure 412 [5/16] 3.2.1 Operator control panel
![Vaillant Boiler Error Codes Explained [Infographic] - Village Heating LTD Facilities](https://sp-ao.shortpixel.ai/client/to_webp,q_glossy,ret_img,w_595,h_829/https://www.villageheating.co.uk/wp-content/uploads/2014/12/vaillant-boiler-error-codes-2.jpg "Vaillant Boiler Error Codes Explained [Infographic] - Village Heating LTD Facilities")
Vaillant Boiler Error Codes Explained [Infographic] - Village Heating LTD Facilities
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![Vaillant ecoTEC exclusive 843 [6/16] 3.4 Displayed symbols](https://mans.io/views2/1492403/page6/bg6.png "Vaillant ecoTEC exclusive 843 [6/16] 3.4 Displayed symbols")
Vaillant ecoTEC exclusive 843 [6/16] 3.4 Displayed symbols
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I have a Vaillant 835 ecomax with code S28 the heating will not come on and there is not hot water, any thoughts
Turn off the preheat on your Vaillant combi boiler
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![Vaillant ecoTEC Plus 412 [9/20] 3.5.1 Displayed symbols](https://mans.io/views2/1492904/page9/bg9.png "Vaillant ecoTEC Plus 412 [9/20] 3.5.1 Displayed symbols")
Vaillant ecoTEC Plus 412 [9/20] 3.5.1 Displayed symbols
Ask Vaillant | Domestic Boilers | Vaillant
Turn off the preheat on your Vaillant combi boiler
