Jose R Miami , FL December 22, 2015 Appliance: Model IBMS1455WW0 WHITE IKEA GLASS BUILT IN MICROWAVE Intermittent cooling fan operation Troubleshooting found the fan was good when remove and directly powered. When commanded on thru the test mode, intermittent operation was confirmed. Suspected main board. After tapping relay area of main board, fan would click on and off back to life. Proceeded with ordering main board, installed, problem solved. Read More... Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes Tools: Screwdrivers