hello l wonder if you can help me, my c/h is blowing 3amp fuses the system is about 20 yrs old and the timer is a glow worm. when the hot water clicks on there is no problem but when the heating kicks in about a minute later it blows the fuse,it's been doing this a while and only blew a fuse about once a week but now it's every time the heating comes on, so as you can guess we have no heating. l'm tipping it's the timer, can you please help asap as we have a 4 yr old and no heat. thanks
p.s what and where is the Syncron motor in the 3 way valve.