Can anyone confirm the correct wiring needed to fit 2x BDR91 receivers?
I have a Y plan system with a Gloworm 12HXI boiler, a Grasslin Towerchron QE2 programmer in the kitchen and a thermostat in the hall.
From what I can gather, 1 is HW off, 3 is HW on and 4 is CH On on the current programmer.