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what does f.22 means on a vaillant boiler?

on my vaillant boiler f.22 appears what does it mean pls and the hot water gets cold once this appears f.22
johnny, January 2009
can be a number of things but most likely low water pressure in system, can be confirmed by pressure gauge on front of boiler, too low if below green band.

tojo, February 2009
link Click here to see other fixes for Vaillant.