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hot water not working?

I have a vokera 20-80 rs flowmatic. My heating is working fine but my hot water is not working at all. i have noticed that the pressure gauge is at 0. do you have any ideas how to fix it?
lillian, September 2013
there should be filling loop pipe connected between two pipes with valves for turning to fill pressure
fill to 1.5 bar than close

k, September 2013
link Click here to see other fixes for Vokera.