Service and Repair, System Maintenance, Advantage...
Answer
my small tank in the loft off the central heating is boiling over?
if you are replacing a contactor the best way to do it is to replace wire for wire. if you have already removed the old one you will have a lot of trouble unless you can read schematics. but here are some tips: install incoming power on the L1 L2 sides. Give me a more detaIled question and i can walk you through it