Vaillant F.70 fault code (Before 2012 model)
How to sort Vaillant F.70 fault code (Before 2012 model) Encountering the Vaillant F.70 fault code (Before 2012 model) on your Eco Tec boiler can be frustrating. This error commonly appears when replacing the Printed Circuit Board (PCB), indicating an invalid Device Specific Number (DSN). Follow these steps to properly set up a new PCB…
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