Question about CDA Microwave Ovens

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Power but no heat

Unit clearly taking power, as we have LED display and turntable turns, but there's no heating taking place. What needs replacing?

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If you have no power in the microwave, check to see if the outlet is good by plugging something else into it. If there is power, you may have blown the internal thermal fuse, or the door switch may be defective. Either of these will keep your microwave from working. The thermal fuse protects both you and the oven by blowing if there is too much power going through it. When a fuse blows, it means that the wire inside that conducts electricity has broken, usually because of an electrical overload. When it blows, you need to have a professional microwave repair person replace it. If this is not the problem, it may be that your door switch has become defective. If the door switch isn't working properly, it won't let the circuit complete to operate microwave components.

Posted on Feb 19, 2009

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If that doesn't work, leave it unplugged for about 5 minutes.

Please note that FixYa is not currently notifying us Experts when Clarification Requests are answered.

So if you need further free help, please post a
NEW problem to FixYa, and please include your brand name and the full model number from the tag in or on the unit, and your symptoms.

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Over the last week the light on the inside of the microwave has dimmed and now it doesn't come on and the turntable doesn't work. Will replacing the light bulb correct the problem? Somehow the microwave...


I think you very possibly have a 2 part problem. Firstly, replace the lamp assembly, then replace the turntable motor. If you have a little electrical knowledge, place a tester on the turntable wires when microwave is on and check for voltage.Remember, run microwave as if you were cooking (Place water in unit when switched on).If there is power, then the motor is faulty.

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1 Answer

Whirlpool MH1140XM: has power, but no heat, turntable not spin.


Test the high voltage capacitor, the rectifier diode.or the magnetron.

The diode and capacitors can br tested. The capacitor must be allowed discharge before testing, or you risk to get electrocuted, even if power is off. Capacitors can get discharged by shorting their two contacts.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.

All locations, and description of this parts can be located using the diagram here: Counter top.

Parts must be tested to find out what is wrong.

Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.

Regarding parts, contact the seller here to purchase parts.

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1 Answer

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1 Answer

I have a JVM1603BJ03 space saver micro wave. The turn table cracked in two, the plastic support device to turn the glass table has desenigrated into several small pieces. It appears the micro wave is...


Do you cook a lot of popcorn?

Do you place your food items in the center of the turntable as opposed to placing them off-center?

Both can cause repeated heating of the same spot on the turntable, which can stress it and allow it to crack.

You can buy replacement parts here.

I suggest that when you cook popcorn, place a paper plate or two upside-down under the bag and always place your food items off-center on the turntable tray.

Once you have the new parts, I would suggest at least a quick heat test. That is to heat one cup of water on high and it should boil in about 2 to 2-1/2 minutes.

If you would like to perform a more standard heat test, please see my Ask Mr. Microwave page.

If your magnetron is indeed running too hot, then it is probably dying. Sometimes - like a star - they can burn hotter right before they die.

We're happy to help and we appreciate your thoughtful rating of our answer.

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