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My Keston C40 will only heat up the central heating water if the hot water ?

My Keston C40 will only heat up the central heating water if the hot water is on as well. Can you help me with where the fault lies?

Andy Armstrong
March 2010
Heating, Home Heating SystemsHeat Water Hot
is your system is a y plan with a 3 port valve ?
or s plan with 2 x 2 port valves

hi-spec plumbing & heating (essex)
March 2010

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