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how can i fix vokera unica he red light code 40?

came back from few days holiday no pressure on bar at all and code 40 shown unfortunately when the system was fitted a few months ago did not get a users handbook, can anyone help? Thanks

Pat
April 2010
VokeraHeating, Home Heating SystemsVokera Red Light
it means low pressure, you need to top it up.

get manual here....

http://vokera.co.uk/wp-content/uploads/2009/04/unica-he-installation-and-servicing-manual.pdf

Ian
April 2010

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