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Hi i've got a problem with my highflow 400 rsf boiler,when i have the ch on the radiator are warming up ok but when i turn hot water tap on hot water come out ok,but when i turn hot water tap off even with CH turned off and room stat off but hw on the radiators start to ge hot. When i turn HW...

Hi i've got a worcester bosch highflow 400 rsf,just had worcester bosch out to it 2 months ago,they fitted a new dhw heat exchanger,pump and serviced it. Its been great until i switched ch on it was on for about 1 hour then i turned it off using room stat,but now it not supplying hot water and...