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Vaillant turbotec VCW 255 E?

Hello,

My heating system is giving a F 22 in the display when warm water is needed. What does this error code means for this type of system?

Thanks in advance...
Henri, March 2009
Its probably because to low waterlevel.

jan, May 2010
I am having the same problem and don't know what to do.

March, 13th.

Susana Aguado, March 2010
link Click here to see other fixes for Vaillant.