Boiler mate 2000 new boiler

[Unregistered]

Hi,
Please help, I've installed a new vaillant 415 ov boiler to a system that has a bm 2000, it's not working the whole job has been a mare, from having to back fill the system to boiler not firing as the return is warmer than the flow to the bm 2000 pump over run not working and causing f83, any advice welcome

 

[Dotty]

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