It is probably MEL for ECAM caution/warning-it means ECAM IGN FAULT displaying function, not for ignition itself. Ref.74-09-01 ENG 1(2) IGN A(B)(A+B) FAULT Alert. You can dispatch A/C with IGN 1 A+B FAULT if it is false warning,for example. Maintenance is required to verify normal ignition operation.