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The heating runs for 1 or 2 minutes then its sounds almost like the water supply to the pump slowly fails. The pump clearly sounds like water is passing through but then it gets slowly quieter. ..

Hi all My Isar HE24 had very poor hot water coming out of the taps. So I run the hosr through the heat exchanger and this was clean (only 1 year old) but when i checked the diverter valve, this was all bunged up. So i ordered a new one and but freed up the old one just to get some temperary hot...