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 and clear the F.70 fault code.

Cause: The F.70 fault code is triggered by an invalid DSN.
Common Scenario: Typically seen after replacing the PCB.
Related Error: F.61 fault code often indicates a faulty PCB or, less commonly, a gas valve issue.

“Once you install the PCB, turn on the boiler and wait for the F.70 error to appear on the display. Then follow the steps below.”

Here is the link to buy Vaillant PCB replacement

If still it is showing an F.61 error, you can place the order for Gas valve