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Hello, this is going to take some work. If you can send me a clear, well focused picture of the boiler wiring diagram I will mark it up with trouble shooting instruction.... it it looks like the project is going go on for more than 30 minutes of my time, I will submit an additional service request.
Let me know if that will be OK with you. We can go from there.
To attach a photo use the paper clip icon at the right end of the tool bar above.
Make sure the thermostat is set for heat and up to 90F for this test, make sure the power switches are on to the boiler, look for a vent damper on the flue, make sure that opens, if not tell me about it
We can go from there.
That will work, see you in the morning.
Be sure not to run any of those jumper tests for more than 5 seconds, beyond the time that the boiler fires... the purpose of the test is to determine what switch is open that is preventing the boiler firing sequence and not more than a few seconds longer...as those are all safety switches... if there is air in the system or the boiler is dry the heat exchanger will be damaged or other bad consequences if you run the boiler for longer than 30 seconds, 5 seconds is safe enough as long as you shut the boiler down immediately after it fires.... once we know what is keeping the boiler from firing we can take measures to resolve the cause.