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probably a D or an E, only condensing boilers are rated A or B

and whys that?,if you tap it and its stuck down,dont think thats gonna work,freed plenty of trvs off with grips

remove trv head and work pin with grips,quite a common fault is the pin stuck down

hi dave,20mbar coming in checked meter governor also,even removed pilot tube and lit when going through sequence,not sure if there is a pilot adjustment screw on this gas valve cant see one??

auto ignition is a really weak pilot,changed pilot injector,ignition board and ignition lead,sometimes goes to full flame,more often goes to lockout, anyone got any pointers??