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new three way valve it the old one was worn so the pin was not working as it should but still letting the water exit

thanks for the help got it sorted it was the 3way valve the pin that trips the micro switch was not coming out far enough to trip the switch (ll done now thanks very much for the help

hi all i have a ravenheat rsf 820t combo boiler the problem is the dhw will not auto light the only way i can get hot water is to switch over to ch it then egnights and i run the water (hot water)and then switch off the ch can anyone help i don't know if it is the three way valve or micro...