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Tell me where the operating temperature control is set, and where the high limit control on the boiler is set please, we can go from there.
Hello, there are hundreds of possible wiring configurations.... those external to the boiler that you describe are important, but not the problem right now.
The problem right now is that the two (2) thermostats *inside the boilers control panel or mounted onto the side of the boiler, are set too high, or defective... it is *only those two that will keep the boiler from over heating.
Let me know a lot about your skill sets with electricity and appliances so that I can coach you most effectively... if any of this is not in your bag of tricks, tell me which direction you are from the center of the nearest city and I will get you a short list of well rated boiler outfits in your area.
We can go from there.