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GE Microwave Doesn't Heat

JVM1870BF02

The 7 most common part(s) or condition(s) which contribute to the symptom Microwave doesn't heat are listed below. Check or test each item and watch any available videos. If you are still unable to solve the problem you may need to do additional research and troubleshooting. Remember, with our 365 Days. Period.® return policy you can return any part for any reason. So, go ahead and buy it to try it. No other parts retailer offers this unconditional return policy.

For the symptom you selected, these are the most common parts or causes, ordered by the likelihood of fixing the symptom.

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Diode - Part # 254740 Mfg Part # WB27X1160

Diode

RepairClinic Item # 254740

The high voltage diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron which emits the energy that cooks the food. If the diode burns out, a lower A/C voltage reaches the magnetron, which is not sufficient to power the magnetron. When the diode fails it is often visibly burned out. If it appears to be good, it can be tested with a volt-Ohm meter capable of testing diodes. High voltage diodes frequently fail and are one of the most common points of failure in a microwave oven. A regular meter with a diode checker will not work to check these diodes. You have to use a meter with a 9 volt battery or put a 9 volt battery in series with the diode to check it.

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$61.35

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Magnetron - Part # 254542 Mfg Part # WB27X10017

Magnetron

RepairClinic Item # 254542

If the microwave oven doesn't heat the magnetron tube might have burned out. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. If the microwave oven is turned on when it is empty this can cause the magnetron to burn out. Once it is burned out it has to be replaced, it's not repairable.

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$204.70

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High Voltage Capacitor - Part # 254536 Mfg Part # WB27X10011

High Voltage Capacitor

RepairClinic Item # 254536

If the microwave doesn't heat the high voltage capacitor might be defective. The high voltage capacitor works with the high voltage diode to convert the output of the transformer to DC voltage and to double the output voltage. If the capacitor is burned out the entire high voltage circuit stops working properly. The high voltage capacitor can be checked with a special VOM meter which has a capacitance testing capability. Be aware that the high voltage capacitor can retain a charge of more than 3,000 volts and can injure or kill a person if not handled properly. Only trained technicians should perform this type of testing.

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$57.40

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Thermal Fuse - Part # 254709 Mfg Part # WB27X1127

Thermal Fuse

RepairClinic Item # 254709

If the microwave doesn't heat the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.

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$23.00

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Thermal Fuse - Part # 769912 Mfg Part # WB27X10166

Thermal Fuse

RepairClinic Item # 769912

If the microwave doesn't heat the thermal fuse may have blown. It can be tested for continuity. Watch our fuse testing video for more information.

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$19.30

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Thermoprotector - Part # 1086422 Mfg Part # WB27X10810

Thermoprotector

RepairClinic Item # 1086422

If the microwave doesn't heat the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it's blown.

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$11.85

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Main Control Board - Part # 942857 Mfg Part # WB27X10604

Main Control Board

RepairClinic Item # 942857

If the microwave doesn't heat the main control board may be defective. This is not common. When a microwave doesn't heat the problem is usually a faulty door switch or within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.

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