Just been called to my daughter's house as she switched the central heating back on and the heating part is not functioning.
Does the Y Plan have a three positon valve ? Anyway this system seems to have just a 2 way valve which I can latch into the heating position manually and then the hot water controller fires the boiler and distributes heat to the central heating circuit.
I can just about hear the central heating thermostat click but that doesn't fire the boiler. So does the 2 way valve have to be motored over to the central heating position and that is what triggers the boiler?
AJH