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home Fix label Heating label_important Home Heating Systems category Vaillant

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
home Fix label Heating label_important Home Heating Systems category Vaillantdone
codes starting with S are staus codes - s.4 means the burner is ignited. Fault codes start with F

Stevo, January 2009
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