I just had this happen on a 1230 with a Siemens softstart. Apparently security silenced the fire alarm at like 1 am and it wasn't til 6 am when they changed shift that they noticed the smoke filling the rest of th building.

I could not recreate it after we replaced the valve and the oil. MLT works correctly every time I test it. Has anyone ever heard of a softstart doing this? I have to think that the controller was providing the run signal somehow.