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How to fix Vaillant ecotec plus 624 R1. Shows fault code F75?

Our Vaillant ecotec plus 624 R1 has stopped working and shows fault code F 75. What does it mean, and how to fix it.
Pete, October 2009
how to open a front cover of echo pro

john, September 2013
1st check water pressure in boiler by pressing "-" button should be 1mbar-1.5mbar if it is you either have a pump problem or a water pressure sensor seek expert help

GasWise jimmy, November 2009
Go here for some useful information on this fault code

http://www.screwfix.com/talk/thread.jspa?threadID=59288

Alan, October 2009
link Click here to see other fixes for Vaillant.