I have just moved into a new house which has a combi boiler (previously normal with HW cylinder) however the owner retained the Centaurplus C27 clock and just had hot water set to 24/7 to give a live to that circuit. Coming to replace with a hive single Chanel unit and looking for some help. At present it’s wired up for the centaurplus with a neutral to terminal 3 and live to terminal 4 - nothing in 1&2. Would I be right in saying that 3 is HW on and 4 CH on. If so looking for suggestions, is it just a case of bridging the HW on (neutral) into the perm neutral. Assuming neutral and live given colour of sheathings on the wires. Any help much appreciated.