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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

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