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New central heating controller

We were called to have a look at a heating system that wasn’t working as it should. The radiators were getting hot when the hot water was activated. Something was clearly wrong.

We diagnosed the problem to be an incorrectly wired central heating controller.

It took a while to trace the wires back to the 2 zone valves, oil boiler and circulation pump. Once we knew what went where, we could wire up the new controller.

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