Microwave Not Heating – What Part Fixes This Problem?
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Understanding the Problem
When your microwave turns on and sounds normal but food stays cold, the heating system has failed. The magnetron is the component that generates microwave energy to heat food. If the magnetron burns out, the microwave will run but produce no heat. Other common causes include a failed high-voltage diode, a blown high-voltage capacitor, or a defective door switch that is not signaling the control board properly.
Common Causes
- Burned-out magnetron
- Failed high-voltage diode
- Blown high-voltage capacitor
- Defective door switch
- Faulty high-voltage transformer
Popular Parts That Fix This Problem
These are the most common replacement parts that fix this problem. When you're ready to order, click below to find the right part at PartsDiscount.com — just search by your appliance model number for a guaranteed fit.
Helpful Repair Tip
WARNING: Microwaves store dangerous high voltage in the capacitor even when unplugged. Never attempt to service internal high-voltage components unless you have proper training and equipment. If the microwave runs and the turntable spins but food is not heating, the magnetron or diode is the most likely cause. A professional can test the magnetron and diode with a multimeter safely.
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