I inherited a BAXI when I moved house.
It is connected to a 3-port motorised valve (activated when the Central Heating comes on),
a Hot Water cylinder, a pump, and a timer control (POTTERTON EP20000) with seperate CH and HW switches.
My problem is that we have no wiring diagram and I want to add a wireless Room Thermostat to the system.
Currently there are no room thermostats!
Can anyone help?