Laguna 3 ABS light flashing

Hi all I have recently had a secondhand abs pump/module

fitted to my 2008 Laguna 2.0 dci estate. It has the correct part numbers as the original.The initial fault has gone which was brake system failure with abs light solidly illuminated. Now everything works o.k.with the exception of the abs light on dash flashes continually.

Any help would be appreciated.