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heating help please

hi back again
been round this afternoon.
i did what i was advised to do ie turn down water temp on boiler , close all rads bar the ones that don't work and run over night.

today the two problem rads where luke warm when i got there so i turned the temp up and not a lot happened . i have re 'bled the whole system again starting with the problem rads and working my way upstairs . when bleeding them i closed the return pipe bled a load of water out then closed it and did the same with the feed pipe.

also i forgot to say that when the boiler is turned on the temp climes very quickly when i reaches temp the boiler cuts out and the temp seems to fall very quickly like 1 degree per second
 
been back today . turned off all the rads and ran the boiler with the temp turned up . ill see what happens
 
then you either have a pump problem, a blockage or the mother of all airlocks. might have to bite the bullet and get someone in.
 

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