BoilerFaultCodesWhat the manual says
Manufacturer manualWater pressure sensor check is running, demand (DHW or heating) is blocked
From this model's manual
Verified against the Vaillant/Vaillant Ecotec Exclusive 74c27d installation & service manual, page 43.
DIY fix possible
Wait for the check to complete (usually takes less than 1 minute)If the code persists, check the boiler pressure gauge is between 1 and 1.5 barIf pressure is low, top up the system using the filling loopPress the reset button if the code remains on screen for an extended period
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