Kingfisher mf boils now and again

[wxs2005]

Hello
My Kingfisher mf boils now and again sometimes will run nomal and switch off on boiler stat and not boil. I think the pump must be working as pipes run upstairs then down to rads in front room as I have solid floors and rads work ok but its just now and agin it happens so if I go out I have to manually switch off power to boiler.

any help apreciated

Thanks
Ron

 

[nicknox]

Had this problem with a few mf's. Normally the pcb.

 

[kevplumb]

can't somebody design and build a pcb that is not forever going tits up

not just these all of them