In-stock parts ship the same dayMicrowave Repair FAQs: Troubleshooting, Parts & Fixes
Start by checking the outlet, breaker, door latch area, line fuse, thermal fuse, thermostat, and switch holder before replacing electronic controls. A microwave that is completely dead often has a power path problem, while a microwave that runs but does not heat usually points to the high-voltage heating circuit. Use the microwave repair help page to choose the closest troubleshooting path.
Use the model number from your microwave label to filter parts that fit your exact unit. You can also search by part number if you already have the old part in hand. Start with microwave replacement parts to narrow by model, symptom, or part category.
A microwave that runs but does not heat often has a failed diode, door switch, magnetron, thermostat, high-voltage capacitor, or main control board. The high-voltage capacitor can store a dangerous electrical charge even after the microwave is unplugged. Discharge the capacitor before touching high-voltage components, or refer this repair to a qualified technician. Use microwave not heating troubleshooting to compare the common causes.
Yes. The diode helps convert voltage for the magnetron, and a burned-out diode can keep the microwave from producing heat. The high-voltage capacitor can store a dangerous electrical charge even after the microwave is unplugged. Discharge the capacitor before touching high-voltage components, or refer this repair to a qualified technician. If a qualified test confirms the diode is bad, match the correct part through microwave diode, magnetron, and resistor parts.
Yes. If a door switch fails, the microwave may not start or heat because the control system does not confirm that the door is closed. A damaged or misaligned switch holder can also keep the door switches from actuating correctly. Browse microwave door switch parts if testing points to a failed switch.
Replace the Magnetron only after more common causes have been ruled out. The high-voltage capacitor can store a dangerous electrical charge even after the microwave is unplugged. Discharge the capacitor before touching high-voltage components, or refer this repair to a qualified technician. Because Magnetron diagnosis and replacement enter the high-voltage section, use a qualified technician unless you have the required training and procedures. Match any confirmed replacement by model number.
Yes. The high-voltage capacitor works with the diode to supply voltage to the magnetron, so a failed capacitor can keep the microwave from heating. The high-voltage capacitor can store a dangerous electrical charge even after the microwave is unplugged. Discharge the capacitor before touching high-voltage components, or refer this repair to a qualified technician. If testing confirms failure, match the replacement through microwave capacitor parts.
A microwave that is completely dead may have a blown line fuse, failed thermal fuse, bad thermostat, damaged switch holder, door switch problem, incoming power issue, or failed main control board. Check the outlet and breaker first, then test fuses and safety switches before replacing the control board. Use microwave not working troubleshooting for the full diagnostic path.
Yes. A blown line fuse or thermal fuse can shut the microwave down completely. The high-voltage capacitor can store a dangerous electrical charge even after the microwave is unplugged. Discharge the capacitor before touching high-voltage components, or refer this repair to a qualified technician. If a qualified inspection reaches an internal fuse, test it according to the model procedure and also identify why it failed before replacing it. Match replacements through microwave fuse, thermal fuse, and breaker parts.
If the microwave runs but the light does not work, start with the bulb or lighting assembly before checking switches, sockets, wiring, or the control board. Some models use a replaceable bulb, while others require replacing the full light assembly. Use microwave light bulb troubleshooting and shop microwave lighting and light bulb parts by model number.
A microwave that starts and then shuts off may have a door switch problem, faulty thermostat, overheating issue, bad touchpad, control board problem, or high-voltage component failure. Start with the door switches and thermostat because they can interrupt operation for safety. Use microwave shuts off after a few seconds troubleshooting to narrow the cause.
If the microwave heats but the turntable does not rotate, check the glass tray, drive coupler, roller guide, and turntable motor. A damaged coupler or worn tray support can keep the tray from moving even when the motor is working. Use microwave turntable not turning troubleshooting and browse microwave glass tray, coupler, and support roller parts.
Yes. If the tray, coupler, and roller guide are seated correctly but the turntable still will not move, the turntable motor may be defective. Disconnect power before accessing the motor and test it according to the wiring diagram if you are comfortable with electrical checks. Use microwave motor parts to find a model-specific replacement.
If some microwave buttons work but others do not, the touchpad or control panel may be defective. If none of the buttons work, check power, lock settings, wiring, and the control board before replacing the keypad. Use microwave buttons not working troubleshooting and compare microwave touchpad parts.
Yes, but control boards are often misdiagnosed, so check power, wiring, touchpad response, fuses, and door switches first. A failed main control board can prevent the display, buttons, or outputs from working correctly. If testing points to the board, compare microwave circuit board and timer parts by model number.
A blank or dim display may be caused by an incoming power issue, failed display board, main control board problem, loose connection, or fuse issue. Confirm the microwave has power and that the outlet and breaker are working before replacing electronic controls. Use microwave display not working troubleshooting to check the likely causes.
Some over-the-range microwaves use a vent fan thermostat that automatically turns the fan on when heat builds up, which can be normal operation. If the microwave cooking function starts by itself, or if the fan runs at unexpected times, check the touchpad, control board, door switches, and thermostat. Use microwave turns on by itself troubleshooting to separate normal fan operation from a part failure.
Sparking or arcing can be caused by metal in the cavity, a damaged waveguide cover, burned food buildup, chipped interior paint, a damaged rack support, or a defective diode or magnetron. Stop using the microwave until the cause is found because arcing can damage the cavity and high-voltage parts. Use microwave sparking or arcing troubleshooting before ordering parts.
Yes. If interior paint is chipped and bare metal is exposed, the microwave can spark or arc during operation. Clean the cavity, remove loose paint, and repair only with microwave-safe cavity paint if the surface is otherwise intact. If there is heavy burn damage or cavity damage, stop using the microwave.
A microwave door that will not open or close correctly may have a broken door latch, latch spring, door hook, hinge, handle, or switch holder. Do not force the door, because damaged latch parts can also affect safety switch operation. Use microwave door troubleshooting and shop microwave door parts.
Yes. The door latch and switch holder need to line up correctly so the door switches are actuated when the door closes. If the latch is broken or the holder is loose, the microwave may not start, heat, or respond correctly. Match replacements through microwave latch parts.
If an over-the-range microwave exhaust fan will not run, check the fan motor, control module, control board, thermostat, fan blade, and wiring. Make sure the vent path is not blocked and that the fan blade spins freely before replacing the motor. Use microwave exhaust fan troubleshooting and browse microwave blower wheel and fan blade parts.
A loud microwave may have a worn fan motor, noisy turntable motor, damaged roller guide, loose blower wheel, failing magnetron, or rattling tray support. Listen for when the noise happens: during turntable rotation, fan operation, or heating. Use microwave loud or noisy troubleshooting to narrow the source.
Yes. Worn fan motor bearings can cause rumbling, squealing, or grinding noises, especially when the cooling or exhaust fan runs. Confirm the sound is coming from the fan area before replacing the motor, then search by model number to find the correct replacement.
A microwave that trips the breaker may have a shorted door switch, failed line fuse, shorted High-Voltage Capacitor, damaged wiring, faulty High-Voltage Transformer, or household circuit issue. Do not keep resetting a breaker that trips again. The high-voltage capacitor can store a dangerous electrical charge even after the microwave is unplugged. Discharge the capacitor before touching high-voltage components, or refer this repair to a qualified technician. Use microwave tripping circuit breaker troubleshooting to narrow the symptom before replacing parts.
A burning smell can come from food residue, arcing, a damaged waveguide cover, overheating wiring, a failing motor, or a high-voltage component problem. Unplug the microwave and stop using it if you smell electrical burning, see smoke, or notice visible damage. Use microwave burning smell troubleshooting to identify the likely source.
A microwave that will not turn off may have a stuck door switch, failed control board, shorted relay, touchpad problem, or issue with the fan thermostat on over-the-range models. If the cooking function continues when it should stop, unplug the microwave until the failed part is identified. Use microwave will not turn off troubleshooting to check the common causes.
Many DIYers can handle glass trays, roller guides, drive couplers, light bulbs, handles, filters, grilles, racks, and some exterior parts when the unit is unplugged. The high-voltage capacitor can store a dangerous electrical charge even after the microwave is unplugged. Discharge the capacitor before touching high-voltage components, or refer this repair to a qualified technician. Match every part by model number before ordering.
Use a licensed technician for high-voltage microwave repairs, including magnetrons, high-voltage capacitors, transformers, diodes, and repairs that require discharging the capacitor. You should also stop and get professional help if there is smoke, repeated breaker tripping, electrical burning, or visible wiring damage. Use the symptom and model number to decide whether the repair is safe to handle yourself. The high-voltage capacitor can store a dangerous electrical charge even after the microwave is unplugged. Discharge the capacitor before touching high-voltage components, or refer this repair to a qualified technician.
Your microwave model number is usually listed on a rating label inside the door, on the door frame, around the control panel, on the back of the unit, or along the interior frame. Use the full model number, not just the brand or serial number, so you can match parts correctly. If you need help locating it, use the microwave model number help page before shopping for parts.
Start by checking the outlet, breaker, door latch area, line fuse, thermal fuse, thermostat, and switch holder before replacing electronic controls. A microwave that is completely dead often has a power path problem, while a microwave that runs but does not heat usually points to the high-voltage heating circuit. Use the microwave repair help page to choose the closest troubleshooting path.
Use the model number from your microwave label to filter parts that fit your exact unit. You can also search by part number if you already have the old part in hand. Start with microwave replacement parts to narrow by model, symptom, or part category.
A microwave that runs but does not heat often has a failed diode, door switch, magnetron, thermostat, high-voltage capacitor, or main control board. The high-voltage capacitor can store a dangerous electrical charge even after the microwave is unplugged. Discharge the capacitor before touching high-voltage components, or refer this repair to a qualified technician. Use microwave not heating troubleshooting to compare the common causes.
Yes. The diode helps convert voltage for the magnetron, and a burned-out diode can keep the microwave from producing heat. The high-voltage capacitor can store a dangerous electrical charge even after the microwave is unplugged. Discharge the capacitor before touching high-voltage components, or refer this repair to a qualified technician. If a qualified test confirms the diode is bad, match the correct part through microwave diode, magnetron, and resistor parts.
Yes. If a door switch fails, the microwave may not start or heat because the control system does not confirm that the door is closed. A damaged or misaligned switch holder can also keep the door switches from actuating correctly. Browse microwave door switch parts if testing points to a failed switch.
Replace the Magnetron only after more common causes have been ruled out. The high-voltage capacitor can store a dangerous electrical charge even after the microwave is unplugged. Discharge the capacitor before touching high-voltage components, or refer this repair to a qualified technician. Because Magnetron diagnosis and replacement enter the high-voltage section, use a qualified technician unless you have the required training and procedures. Match any confirmed replacement by model number.
Yes. The high-voltage capacitor works with the diode to supply voltage to the magnetron, so a failed capacitor can keep the microwave from heating. The high-voltage capacitor can store a dangerous electrical charge even after the microwave is unplugged. Discharge the capacitor before touching high-voltage components, or refer this repair to a qualified technician. If testing confirms failure, match the replacement through microwave capacitor parts.
A microwave that is completely dead may have a blown line fuse, failed thermal fuse, bad thermostat, damaged switch holder, door switch problem, incoming power issue, or failed main control board. Check the outlet and breaker first, then test fuses and safety switches before replacing the control board. Use microwave not working troubleshooting for the full diagnostic path.
Yes. A blown line fuse or thermal fuse can shut the microwave down completely. The high-voltage capacitor can store a dangerous electrical charge even after the microwave is unplugged. Discharge the capacitor before touching high-voltage components, or refer this repair to a qualified technician. If a qualified inspection reaches an internal fuse, test it according to the model procedure and also identify why it failed before replacing it. Match replacements through microwave fuse, thermal fuse, and breaker parts.
If the microwave runs but the light does not work, start with the bulb or lighting assembly before checking switches, sockets, wiring, or the control board. Some models use a replaceable bulb, while others require replacing the full light assembly. Use microwave light bulb troubleshooting and shop microwave lighting and light bulb parts by model number.
A microwave that starts and then shuts off may have a door switch problem, faulty thermostat, overheating issue, bad touchpad, control board problem, or high-voltage component failure. Start with the door switches and thermostat because they can interrupt operation for safety. Use microwave shuts off after a few seconds troubleshooting to narrow the cause.
If the microwave heats but the turntable does not rotate, check the glass tray, drive coupler, roller guide, and turntable motor. A damaged coupler or worn tray support can keep the tray from moving even when the motor is working. Use microwave turntable not turning troubleshooting and browse microwave glass tray, coupler, and support roller parts.
Yes. If the tray, coupler, and roller guide are seated correctly but the turntable still will not move, the turntable motor may be defective. Disconnect power before accessing the motor and test it according to the wiring diagram if you are comfortable with electrical checks. Use microwave motor parts to find a model-specific replacement.
If some microwave buttons work but others do not, the touchpad or control panel may be defective. If none of the buttons work, check power, lock settings, wiring, and the control board before replacing the keypad. Use microwave buttons not working troubleshooting and compare microwave touchpad parts.
Yes, but control boards are often misdiagnosed, so check power, wiring, touchpad response, fuses, and door switches first. A failed main control board can prevent the display, buttons, or outputs from working correctly. If testing points to the board, compare microwave circuit board and timer parts by model number.
A blank or dim display may be caused by an incoming power issue, failed display board, main control board problem, loose connection, or fuse issue. Confirm the microwave has power and that the outlet and breaker are working before replacing electronic controls. Use microwave display not working troubleshooting to check the likely causes.
Some over-the-range microwaves use a vent fan thermostat that automatically turns the fan on when heat builds up, which can be normal operation. If the microwave cooking function starts by itself, or if the fan runs at unexpected times, check the touchpad, control board, door switches, and thermostat. Use microwave turns on by itself troubleshooting to separate normal fan operation from a part failure.
Sparking or arcing can be caused by metal in the cavity, a damaged waveguide cover, burned food buildup, chipped interior paint, a damaged rack support, or a defective diode or magnetron. Stop using the microwave until the cause is found because arcing can damage the cavity and high-voltage parts. Use microwave sparking or arcing troubleshooting before ordering parts.
Yes. If interior paint is chipped and bare metal is exposed, the microwave can spark or arc during operation. Clean the cavity, remove loose paint, and repair only with microwave-safe cavity paint if the surface is otherwise intact. If there is heavy burn damage or cavity damage, stop using the microwave.
A microwave door that will not open or close correctly may have a broken door latch, latch spring, door hook, hinge, handle, or switch holder. Do not force the door, because damaged latch parts can also affect safety switch operation. Use microwave door troubleshooting and shop microwave door parts.
Yes. The door latch and switch holder need to line up correctly so the door switches are actuated when the door closes. If the latch is broken or the holder is loose, the microwave may not start, heat, or respond correctly. Match replacements through microwave latch parts.
If an over-the-range microwave exhaust fan will not run, check the fan motor, control module, control board, thermostat, fan blade, and wiring. Make sure the vent path is not blocked and that the fan blade spins freely before replacing the motor. Use microwave exhaust fan troubleshooting and browse microwave blower wheel and fan blade parts.
A loud microwave may have a worn fan motor, noisy turntable motor, damaged roller guide, loose blower wheel, failing magnetron, or rattling tray support. Listen for when the noise happens: during turntable rotation, fan operation, or heating. Use microwave loud or noisy troubleshooting to narrow the source.
Yes. Worn fan motor bearings can cause rumbling, squealing, or grinding noises, especially when the cooling or exhaust fan runs. Confirm the sound is coming from the fan area before replacing the motor, then search by model number to find the correct replacement.
A microwave that trips the breaker may have a shorted door switch, failed line fuse, shorted High-Voltage Capacitor, damaged wiring, faulty High-Voltage Transformer, or household circuit issue. Do not keep resetting a breaker that trips again. The high-voltage capacitor can store a dangerous electrical charge even after the microwave is unplugged. Discharge the capacitor before touching high-voltage components, or refer this repair to a qualified technician. Use microwave tripping circuit breaker troubleshooting to narrow the symptom before replacing parts.
A burning smell can come from food residue, arcing, a damaged waveguide cover, overheating wiring, a failing motor, or a high-voltage component problem. Unplug the microwave and stop using it if you smell electrical burning, see smoke, or notice visible damage. Use microwave burning smell troubleshooting to identify the likely source.
A microwave that will not turn off may have a stuck door switch, failed control board, shorted relay, touchpad problem, or issue with the fan thermostat on over-the-range models. If the cooking function continues when it should stop, unplug the microwave until the failed part is identified. Use microwave will not turn off troubleshooting to check the common causes.
Many DIYers can handle glass trays, roller guides, drive couplers, light bulbs, handles, filters, grilles, racks, and some exterior parts when the unit is unplugged. The high-voltage capacitor can store a dangerous electrical charge even after the microwave is unplugged. Discharge the capacitor before touching high-voltage components, or refer this repair to a qualified technician. Match every part by model number before ordering.
Use a licensed technician for high-voltage microwave repairs, including magnetrons, high-voltage capacitors, transformers, diodes, and repairs that require discharging the capacitor. You should also stop and get professional help if there is smoke, repeated breaker tripping, electrical burning, or visible wiring damage. Use the symptom and model number to decide whether the repair is safe to handle yourself. The high-voltage capacitor can store a dangerous electrical charge even after the microwave is unplugged. Discharge the capacitor before touching high-voltage components, or refer this repair to a qualified technician.