Vaillant EcoTEC Plus Regular Gas Boiler Error Codes (Status Codes)

Vaillant EcoTEC Plus Regular Gas Boiler Error Codes Fault Code Possible Cause S.20 Warnstar demand S.21 Fan running S.22 Pump running S.23 Ignition sequence S.24 Burner ignited S.25 Fan and water pump running S.26 Fan overrun S.27 Pump overrun S.28 Anti-cycling mode S.30 No heating demand from external controls S.31 Central heating thermostat knob turned …

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