Central Heating Boiler Electrical Wiring Connection Jan 19, 2012Central Heating Control Wiring. Where control wiring is needed from the boiler to a room stat, programmer or motorised valves etc. you can use 3, 4 or 5 core cables as shown in the wiring diagram above and described below. Pump Over-Run. Programmer & Boiler Wiring | Screwfix Community Forum Dec 30, 2010I have just relocated Central Heating programmer and fused outlet a very short distance but it meant disconnecting and reconnecting the wiring. Despite making a wiring diagram beforehand I have managed to get 2 of the wires from the boiler flex mixed up.
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