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cheers - great idea. I'll let you know how i get on. thanks

cheers, but can't get boiler to stay lit because it goes to a fault code within a minute or two at the most.

thanks. magna clean was clean out thoroughly but circualtion problem still exists.

thanks guys. stupidly i opted for just a standard installation flushing and the fitting of a magnaclean. Installer had recommended powerflushing plus a magnaclean 'cos rads were old. Guess you learn by your mistakes. Someone has suggested that the heat exchanger could be partially blocked...

Hi, got a glow worm flexicom 18hx which had been working fine for six months. It suddenly stopped working so I called out the glow worm engineer who said it is an F22 problem and that was to do with circulation and to call the installer. However the boiler comes on for a short period of time...