Jack W San Leandro , CA January 31, 2015 Appliance: General Electric Free Standing Microwave JVM1870SK03 Ge Microwave Jvm1870sk03: I got an "time to change charcoal filter" message on the microwave screen it was already in house when i purchased it there was no filter. How to replace Carbon Range Hood Microwave Filter 6-3/16" X 8-11/16" X 1/4". After going to Appliance Parts Pros website, and reading the options available and recommended based on how the microwave is installed and vented, I decided the charcoal filter was the way to go. 4 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: Less than 15 minutes