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Hi Replaced the diaphragm in the 3 way valve. £20 job. All sorted. Thats something they don't mention in the troubleshooting manual. Hope this helps someone else fix their boiler

Hi My combi boiler (3 years old) has started doing an odd thing recently. It fires up normally when running hot water and heats the water to really hot. But, if I then turn on a cold tap, the hot water temp drops significantly. (All this time the gas boiler is still actually heating the...