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Im looking at fitting a new programer into a Junction box, It has 4 wires at the moment, new one is the same, so i can use the same back-plate, my problem is (if it is a problem).... the existing wire seems to be like a phone or data cable, it looks very thin, there is nothing i can find...

Hi there got a question My friend has had a new heating system fitted (system boiler + unvented cylinder) large area down stairs with 10 rads, small area upstairs, 3 rads, it has two zone valves fitted to a lifestyle wiring centre, the zone valves are Honeywell 272848/u 5 wire valves, Is...