linda the best advice i would give you is have the boiler serviced by a qualified engineer.
has this boiler ever worked? how old is the boiler? are there any valves been fitted past the first rad? is it a sealed system?
you can get a service manual from the vokera site, http://www.vokera.co.uk/trade-professionals/manuals-literature/
stewart mclean
April 2010
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