is the pump working? if so turn off the valves to all the upstairs rads then turn on the heating then turn it up to full, run the heating for 20mins and see if thay get warm, if so it was an air lock, you`ll hear the air move if it is, then re open the valves upstairs, but notice how many times you turned the valves, then reopen them the same amount
m.edwards
November 2007
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