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Mend Vaillant Home Heating Systems

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Mend Vaillant Boiler Appears Water

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
VaillantHeating, Home Heating SystemsBoiler Appears Water
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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