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Mend Vaillant Home Heating Systems

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Mend Vaillant Boiler Fault

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
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