do not take O ring out as its not easy to fit on casing if you buy new heat exchanger O ring come with
ltd
January 2012
if you are technical minded or knowledge of central
heating, switch off power to boiler ,you have to drain out system from drain point open all rads air vent to let water out ,shut cold supply to boiler open hot water taps to drain water,than undo heat exchanger with lan key long one, clean out with sprit of salt clean out with water,refit
ltd
January 2012
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