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How difficult or easy to replace pump on boiler?

We have a Vaillant Thermocompact 615EH boiler which has started to get noisy and needs replacing. It looks relatively simple to replace but would welcome advice as I can't find a repair manual.

Dudley
May 2013
VaillantHeating, Home Heating SystemsPump Boiler Vaillant
to replace pump you only need to replace head of pump and not all of it ,drain down system ,to make it empty ,undo four bolt on pump with l-n key replace head,refil water vent pump from undo big silver middle nut on pump

ltd
May 2013

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