salus rt500rf to ecotec plus 824

Hi, I'm hoping someone can help me.......... I'm trying to wire a Salus rt500rf unit to a vailiant ecoTEC plus 824 combi boiler. It is currently wired to a faulty Drayton Digistat SCR as per the below images. Fused spur in to to N,L & Earth (image 1) then wired to the boiler (image 2)...