Brooke W Hanson , MA April 25, 2020 Microwave switch was bad. We replaced it. It took a bit to find the bad egg. At first, we thought it was a bad diode, but after testing it, we found that wasn't the problem. We dug deeper after reading online and found a bad micro door switch. It was clearly blown. We called appliance parts pros, ordered the part quickly and it came in 2 days. It cost $6 plus shipping, and saved us >$250 to replace the whole microwave! Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes