Vaillant CI-SI Boiler Error Codes

Fault Codes Fault Description Possible Causes Fault Code F1 Ignition Failure Insufficient Inlet Working Gas Pressure At The Appliance Flue Problem Spark Generation Issue Incorrect Gas Valve Adjustment (Minimum Burner Pressure Set Too Low) Flame Rectification Issue Combustion Issue (Poor Flame Picture) Software Error On The Main PCB Or The User Interface PCB Fault Code F2 Air Fault Fan Fault Fan …

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