Hi everyone, I hope someone can shine some light on my problem, I've pulled most of my hair out so far..! I moved recently and inherited a Greenstar Heatslave II External boiler which in turn is controlled by an old Build Centre 7 day timer and a Honeywell BDR91 Relay Box wired into CH circuit. Basically I thought I would buy a Honeywell T3 wireless with the intention to simplify and better control the boiler, however when I wired up the T3 as per instructions, the boiler will not fire up on either HW or CH... I have attached the original wiring in Build Centre timer for reference. When the original CH/HW triggers (as shown) are put into the correct terminals of the Honeywell T3, the controller works as intended (goes on and off) however the boiler does nothing, neither HW nor CH..?
Any pointers would be much appreciated....
Any pointers would be much appreciated....