How do I get the central heating on? potterton prima F80 boiler fires up, ?

just check the heating diverter valve u can open it manually by turning the slider on the side across. if it free and and easy to move is already open if it requires a little pressure then its closed and u are opening manually. if this is the case then its a faulty diverter or time clock it will require checking

kash
December 2012