How to fix microwave oven Silvercrest SMW 800 C3 that's not heating at all? Witness the miraculous resurrection of our aging Silvercrest Microwave SMW 800 C3 with Grill from Lidl! In this comprehensive repair guide, we share how WD40 contact cleaner played a crucial role in fixing issues and restoring the microwave to its former glory. We repaired this microwave oven with grill cost free.