The frost stat was burnt out I seen it but also needed a vac relay,I may have blown that as I wired the stat wrong.stat cost £24 its not fitted yet,heating ok.
My Firebird boiler(combi,outside) is wired to the light circuit main fuse.On holiday when my daughter switched light on it blew fuse (light)Now boiler not working.
I returned from holiday and replaced 5 amp fuse for boiler and light cicuit,Fuse blew.
Changed live for boiler into the other...