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Mend Vaillant f.22 Home Heating Systems

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Mend Vaillant f.22 Fault Code Heating

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
VaillantVaillant f.22Heating, Home Heating SystemsVaillant Fault Code Heating
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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