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My Vaillant Boiler is showing 5.4 Fault What is it?

My Vaillant Boiler is showing 5.4 Fault What is it? How do I repair it?
MM, December 2008
codes starting with S are staus codes - s.4 means the burner is ignited. Fault codes start with F

Stevo, January 2009
link Click here to see other fixes for Vaillant ecoTEC.