Does the light come on immediately or after the food heats up a bit. A heat source comming on might trip the detector.

I agree that age is no guarantee the oven doesn't leak a bunch of microwaves. There are small testers (Radio Shack used to have them, don't know about now) you can use to test your ovens for leakage. They all leak a little but you don't want a bad leaker as one of the problems from accumulated exposure is cataracts.

Pat [img]/forums/images/icons/smile.gif[/img] [img]/forums/images/icons/smile.gif[/img]