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If it is, how can I check to see if it is and how can I fix Also, should the pressure gage * ALWAYS * move in some way when you open the valves, even if its already been done.

Hello guys I have a Worcester 28i central heating system. Yesterday I came home to find the house was freezing with no central heating and no hot water. It had been left on while I was out in full working order so its not as if I had manually done something to trigger a fault. It...