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Hi Madrab, thanks for getting back to me. Yes the HEX is new. The new divertervalve came about because it was noticed that the central heating pipe was getting hot whilst running the hot water, so renewed at the same time as the HEX. Parts have been flushed, as we've gone on, just can't see or...

Hi, is there anyone that can help me with my boiler problem please? I have a Worcester Green Star 38 CDI classic boiler with hot water issues. When I turn on the shower the water fluctuates between hot and cold. The temperature goes up to 110 and then it cuts out - there are no error codes. The...