Oven function heats up but Microwave function does not
My GE Profile microwave oven model JE1590WC 001 is not working completely. Everything seems to work, even the Convection and combination oven functions ( still heats up) but the microwave function does not heat up. When using the microwave function, besides not heating up any more, it also is making a slightly louder humming sound then usual but does not make that humming sound when using the oven functions. What would make this microwave function not heat anymore but still heat for the oven functions?