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Turn off the preheat on your Vaillant combi boiler
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![Vaillant Boiler Error Codes Explained [Infographic] - VHL](https://sp-ao.shortpixel.ai/client/to_webp,q_glossy,ret_img,w_595,h_835/https://www.villageheating.co.uk/wp-content/uploads/2014/12/vaillant-boiler-error-codes-1.jpg "Vaillant Boiler Error Codes Explained [Infographic] - VHL")
Vaillant Boiler Error Codes Explained [Infographic] - VHL
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