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Thanks for the reply, the system uses two external motorized vales. One for the CH and teh other for HW. I had a problem with the Honeywell motorized valve before but managed to get it to work after stripping it down and cleaning it. I'm not sure how to answer your point 2!! If I switch on...

Hi, Can anyone help with my boiler issue!!! The boiler runs the hot water and central heating, at present the CH is working fine. The timer controll advances the CH switches on and the boiler flames into life. The problem is when I only want the hot water to run, the timer control clicks in...