S Plan Wiring Diagram Vaillant. You just need to connect up the wiring to a two port valve as usual and a cable to fire the boiler. No power to boiler and pump.
A plumber friend of mine has asked for some help wiring up a vaillant ecotec system boiler in an s plan configuration. Wiring and plumbing for ufh with a vaillant ecotec combi boiler. I ahve wired everything as per s plan diagram, all works ok but boiler shuts down when heat demand satisfied and there is.
Was quite straight forward as the thermostats and actuators supplied from uponor are simple to do.
The new vaillant boiler has a different pcb to the older type. Here, coloured wires indicate the permanent mains supply to the boiler and programmer. But when i compared it to the wiring diagram it really did not match. I need an expert's advice.