The microwave will not heat. Everything else works.
The Kenmore microwave will not heat. Everything else seems to be working properly. There are no unusual sounds or smells.
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Cause 1
Diode
The 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 to heat the food. If the diode burns out, the magnetron won’t receive enough voltage to operate, preventing the microwave from heating. When the diode fails, it is often visibly burned out. Inspect the diode and if the diode is burned out, replace it. If inspecting the diode proves inconclusive, test it with a multimeter that uses a 9-volt battery or put a 9-volt battery in series with the diode. When the leads are reversed, the diode should only have continuity in one direction. (Warning: The microwave oven can store a lethal amount of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the high running voltage and the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the diode.)
Cause 2
Door Switch
Most microwaves have three or four door switches. When the microwave door closes, the door switches actuate in sequence to ensure that the door is closed properly. If any of the door switches fails, the microwave will not start or heat. 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 does not have continuity, replace it. (Caution: The microwave oven can store thousands of volts of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace a door switch.)
Cause 3
Magnetron
The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. If the magnetron burns out, the microwave won’t heat. The magnetron is not repairable—if the magnetron is burned out, you must replace it. (Warning: The microwave oven can store a lethal amount of electricity in its high voltage capacitor, even after the microwave oven has been unplugged. Due to the high running voltage and the potential for electric shock, it is extremely dangerous to replace the electronic components in a microwave. Only a licensed technician should replace the magnetron.)
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6 comentarios
I have same problem too with our Whirlpool built in Microwave. Please advise?
- de Jonna
My microwave is a piece of junk. It's a 699.00 Samsung new out the box and wont heat mashed potatoes
- de Stephen Smotts
Is there a relay button on this?
- de Sharon Mercado
My Samsung Microwave also will not heat. I contacted support, and they said my warranty was up two months ago, but offered no assistance to resolve the issue. We bought all new Samsung appliances just over a year ago, and every single one has been repaired. The only thing worse than a Samsung is their support.
- de karensul
I agree 100% about lack of support from Samsung. We also bought all new Samsung appliances the dishwasher was defective from day 1 I fought with Samsung support for 4 months to replace it they refused to refund my $1000 because my autistic son destroyed the sticker that listed the model and serial number. Now the microwave will not heat lesson learned the hard way never buy a Samsung appliance.
- de Francis waldron
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