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This is a crazy one. Slant fin 100 series gas boiler. The boiler went out last week. This is what has been replaced so far.
Gas ignition module, circulator pump, damp vent. The new damp vent doesn’t want to work. The ONLY way to get this thing fired up is if I jump the harness to the vent damp. I can get the boiler to kick on but it will not shut down. I have to shut it down at the switch. I’m jumping #2 black and #3 white yellow and that is the only combination that will work. I had a guy here 3 times and every time he’s left the boiler was running but after awhile it shuts down and I can’t get it to fire up unless I jump it. I should mention that I have to jump it at the female harness that plugs into the damp vent itself. It won’t work if I jump it at the damp harness on the aqua stat. My guy has been doing boilers for over 20 years and even he’s saying “I just don’t get it” Any and all help is greatly appreciated. Thank you fellas.