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 off
S.32 Heat exchanger antifreeze active as fan speed variation is too high
S.34 Anti-frost mode is active
S.36 Not heating demand form low voltage
S.41 Water pressure greater than 2.9 bar
S.42 Response from accessory module or defective condensate pump is blocking burner operation
S.53 Appliance is within the waiting period of the block operation function due to water shortage
S.54 Appliance is within the waiting period of the block operation due to water shortage
S.96 Return sensor error
S.98 Flow return sensor check is running demand is block

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