BoilerFaultCodesWhat the manual says
Manufacturer manualHotwaterhandlingmode:Pumppre-run
From this model's manual
Verified against the Vaillant Ecotec Plus 615 installation & service manual, page 38.
What causes this fault?
This status code appears when the boiler is getting ready to provide hot water. It activates the internal pump for a few moments to ensure there is proper water circulation before the burner fires up. This is a standard safety and efficiency check rather than a mechanical failure.
DIY fix possible
No action is required.Wait approximately 60 seconds for the boiler to complete its cycle and start providing hot water.
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