I have a nice whizzy CM907 that I would like to replace my old thermostat.
The old stat has three wires in red to one, blue to two and yellow to three. The old stat is an apprently boring honeywell.
The system is pumped and has the valve for heating and hot water. Looking at things, and making assumptions - red would be rasonable as live, and go to A, so is it safe to assume 2=B and 3=C?
Ta, Paul