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
