I purchased this unit to replace my previous over-the-oven GE microwave, which had lasted over 12 years.  It was still functioning properly, but the interior paint was peeling.  The newer unit lasted les than 3 years and then failed.  Although electrical functions were maintained (light/fan), it would not heat.  Significantly, GE appliances changed hands in between purchase of the 2 units.  I decided to give it one more chance, as the mounting bracket is now appropriately sized for my backsplash.  Perhaps this was a lemon?  Hard to
 recommend to consumers looking for a new unit.