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Pump some food colouring in the heating system via the filling loop if its shows up in the hotwater then bingo flush out do repairs . cheers kop
cheers kop. done it... but we are pressure testing the ch loop till wednesday, so if no drop from 2bar we will open up the flow and return and run the system... hope to see yellow hot water
I take it that if the engineer had the boiler open and tested it cold he would not see if the heat exchanger is faulty ???