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My Potterton 24 HE Plus system is making a very loud clunking sound. Only occurs when the central heating is on, not when the water is on. The thermostat quickly heats up then cuts off and falls then immediately rises again then cuts off again so the radiators don't actually heat up. It's...

i have a potterton 24 he plus system losing pressure. during summer when radiators not in use pressure is fine but as soon as we start using the rads pressure drops and needs topping up daily. pressure only drops when rads have heated up and we turn the thermostat down. if we had heating on all...