Frigidaire Microwave Not Working


The 3 most common part(s) or condition(s) which cause the symptom Microwave not working are listed below starting with the most likely. Check or test each item and watch any available videos.

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Line Fuse - Part # 639406 Mfg Part # 5304408939

Line Fuse

RepairClinic Item # 639406

Every microwave oven has a line fuse. This fuse is designed to blow if too much current is drawn through the microwave circuitry. The fuse can be replaced, but the underlying issue should still be investigated and resolved. Otherwise the new fuse will blow also.


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Main Control Board - Part # 639318 Mfg Part # 5304408501

Main Control Board

RepairClinic Item # 639318

If the microwave is not working the main control board may be defective. This is not common. When a microwave stops working the problem is usually the line fuse or within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.


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Thermoprotector - Part # 639407 Mfg Part # 5304408940


RepairClinic Item # 639407

If the microwave is not working 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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