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I managed to luck onto the solution myself, If you are interested when I refilled the system after partial drain when fitting a new radiator I put in some cleaning fluid. What I think happened this product cleaned the HW heat exchanger and made it more efficient. The resultant efficency caused...

I have a worcester 240 that has a problem with the hot water. CH runs ok no problems. When I turn on a hot water tap/shower runs ok for about 5-8 mins then makes a noise like an plane flying overhead and the unit trips. I have flushed the water-water heat exchanger and checked the operation of...