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hi great stuff guys heating is on but no hot water :( bled the 3 square valves but where is the fourth also hot water tank hot is it the diverter valve

Hi all this should be simple to some of you out there I have the heatslave 15/19 oil combi it's worked fine .it was taken out two weeks ago as we were having alterations it was re installed the other day filled up etc started up first time, after a few minutes it became apparent that no warm...