Microwave-not-heating-very-well, customer sent to me a campomatic brand microwave oven with the complaint of not heating properly. what i did was to put in a cup of water and set the timer to 20 seconds and let it run.. There are numerous reasons why your microwave doesn’t get properly hot or even hot on the outside. the best solution is to call neff services. you can reach us around the clock, 7 days a week. we’ll repair your microwave quickly, expertly and for a fair price.