Date: Mon, 22 Feb 1993 18:12 EST From: morse@zephyr.rap.ucar.EDU (Corinne Morse) So is there a thermal fuse or cutout that tripped or blew? If so, where can I find it and how to test it. Is there another problem I should be looking for? That sounds like a possibility. The thermal sensor is the device that sticks up from the top center of the backplane. barmar