A:Answer Hi- We are sorry to hear your microwave is not heating and apologize for any inconvenience this has caused you. If the microwave runs but is not heating, it could be one of many components. Make sure the “Timer” function was not inadvertently used. Check to ensure the door is closed firmly. Close it firmly, but do not slam. This confirms the engagement of the door's safety mechanisms. Reset the electronics by unplugging or by turning off power at the circuit breaker for 30 seconds or so. For safety reasons, we offer no do-it-yourself repair advice on microwave ovens due to an internal high voltage capacitor (can hold a high voltage charge even after it has been unplugged). Special equipment is generally needed to make a diagnosis. If you would like to schedule a service appointment, please contact GE Appliance Service at 1-800-432-2737 or schedule a service appointment online: http://www.geappliances.com/ge/service-and-support/service.htm?ICID=GEARsupportflyout-service - Also, GE® 1.7 Cu. Ft. Over-the-Range Sensor Microwave Oven JVM6175DKWW is a comparable replacement model. All 30" over-the-range microwaves are approximately the same width, and are designed to fit into a 30" wide cabinet opening. Each microwave comes with the mounting hardware (mounting bracket, screws, exhaust adapter), top and rear templates, and installation instructions needed to make installation a simple process. This makes choosing a replacement microwave easy. We certainly appreciate your loyalty. Keep in touch! SUE@GEA