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what could be wrong with my chaffoteaux maury britony combi se boiler?

when i run the hot water tap in the downstairs sink the water gets very hot but when i run the hot water to fill the upstairs bath or upstairs sink you can keep your hand under the running tap and the water does not get very hot.
Annie, October 2009
code 70 and 80 indicatesecurity soleniod closed flame detection fault or insufficient gas
have checked gas supply and gas is present

ronnie, January 2010
link Click here to see other fixes for Britony Combi SE.