I found the bottom element was not getting any power by using a volt/ohmmeter and a test method described elsewhere. (Shut off power, hold down COOK TIME while turning on power. then within 30 seconds press each mode you want to test and only that element/fan/etc will turn on. Cancels by itself after 30 sec.)
I traced the wire back to the relay (wire checked good) and there was no power getting through the relay although it clicked. Removed the relay board to replace it and found a cold solder joint on the "out" terminal with obvious past arcing carbon. Cleaned and soldered the pin and the oven now works normally.
WHY THE SLOW TO HEAT? The oven turns on all the elements to preheat faster and when it reaches your set temp it beeps and now only turns on the element you selected to maintain the temperature. (Bake or Convection) Our malfunctioning ovens would then cool since the element is not working properly and it must go back into preheat and keep cycling.
BY THE WAY- Don't ever use 4 hours on self clean it kills the boards and/or display. I also put a house fan in front of the oven and blow it into the lower grill to take away some of the heat on the two boards. Learned the hard way!
DACOR RIGHTEOUS DIAGNOSTCS BABY
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