Hiya,
I want to connect a new Diehl 884 timer to my boiler. Currently there is a analogue Grasslin, but the wires are connected to 1 , 2 , 3 , 4
Where as on the Diehl, it's only 1 , 2 , 3 , 5
Will this work or not do you think? It looks like the wiring diagrams on the back are...