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vaillant turbomax F23 error keeps coming up when I turn on the central heat?

Th heat exchanger and the diverter valve were changed on my boiler as the hot water and the central heating kept cutting. Error F23 kept showing. Now the hot water seems to be working on its own but as soon as you put the central heating on F23 appears and the hot water goes stone cold. The heating still does not work.
Please help.

jeanette
May 2009
VaillantHeating, Home Heating SystemsTurn Central Heat Exchanger Diverter
check out www.mangocontracts.co.uk if you are in london

matthew
February 2011

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