The part(s) or condition(s) listed below for the symptom Microwave light bulb not working are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.
Microwave Turntable Not Turning? Microwave Oven Troubleshooting
Microwave Not Working? Microwave Oven Troubleshooting
Microwave Not Heating? Microwave Oven Troubleshooting
Microwave Light Bulb Not Working? Microwave Oven Troubleshooting
Microwave Is Loud/Noisy? Microwave Oven Troubleshooting
Microwave Exhaust Fan Not Working? Microwave Oven Troubleshooting
Microwave Buttons Not Working? Microwave Oven Troubleshooting
Removing Microwave Trim - Tech Tips from Repair Clinic
Replace Microwave Charcoal Filter - Tech Tips from Repair Clinic
Boil Water in Your Microwave - Tech Tips from Repair Clinic
5 Tips For Your Microwave - Tech Tips from Repair Clinic
Microwave Sparking/Arcing? Microwave Troubleshooting
Microwave Door Won't Open? Microwave Troubleshooting
Microwave Turns On By Itself? Microwave Troubleshooting
Microwave Display Not Working? Microwave Troubleshooting
Microwave Shuts Off After A Few Seconds? Microwave Troubleshooting
What Causes a Microwave to Spark and Arc?The light bulb itself might be burned out. Replace the light bulb before replacing any of the parts associated with the light bulb
To determine if a halogen lamp has failed, you can use a multimeter to test it for electrical continuity, or install the lamp into an identical socket to test it.
Before replacing the control, check the light bulbs, sockets, and wiring. If these parts seem to be working properly, test the control board with a multimeter to determine if it sending the correct voltage to the light bulb socket. If the control board is not sending enough voltage to the light bulb socket, replace the control board.
A defective door switch may not signal the control board that the door is open or closed which may prevent the microwave light from turning on or prevent the button that controls the light from functioning. To determine if any of the door switches are defective, use a multimeter to test each of the switches for continuity. If any of the door switches do not have continuity, the switch or switches should be replaced.
A microwave light bulb not working could be caused by a defective control board, although this is rarely the case. Before replacing the control board, check the light bulbs, sockets, and wiring. If these parts seem to be working properly, test the control board with a multimeter to determine if it sending the correct voltage to the light bulb socket. If the control board is not sending enough voltage to the light bulb socket, replace the control board.
A defective micro switch may not signal the control board that the door is open or closed which may prevent the microwave light from turning on or prevent the button that controls the light from functioning. To determine if any of the micro switches are defective, use a multimeter to test each of the switches for continuity. If any of the micro switches do not have continuity, the switch or switches should be replaced.
A microwave light bulb not working could be caused by a defective power supply board, although this is rarely the case. Before replacing the board, check the light bulbs, sockets, and wiring. If these parts seem to be working properly, test the power supply board with a multimeter to determine if it sending the correct voltage to the light bulb socket. If the board is not sending enough voltage to the light bulb socket, replace the board.
Before replacing the light socket, replace the light bulb. If you replace the light bulb, and the light still doesn’t work, use a multimeter to test the light socket for continuity. If the light socket does not have continuity, replace it.
