What the manual says
Manufacturer manualFillingofproductwith water
From this model's manual
Verified against the Vaillant Ecotec Plus installation & service manual, page 91.
DIY fix possible
Wait 5 to 10 minutes for the boiler to complete the automatic filling processCheck the pressure gauge on the front display to ensure it settles between 1.0 and 1.5 barIf the code persists for more than 30 minutes, restart the boiler using the on/off button
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