I'm now not convinced on the verdict of blue vs red, as I can find conflicting pictures.
I think there is one way to test if you do it safely.
If the blue is the safety cutout (NC), then the oven will fail to work with one terminal disconnected. If it isn't the safety cutout, then the fan won't start.
All caveats about playing with mains electricity apply.
It may well be that you should have replaced the red.
BTW, if there are different amperage ratings on the two, my money's on the higher being the safety cutout.
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