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Runs on half power and won't heat (microwave)

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Hi sharp microwave R-33ST 900w was used to defrost now won't heat anything up how do I change settings back?


It should default to the highest power setting.

If not, you can reset it by unplugging the power for a minute or two, plugging it back in, and setting the clock.

Otherwise, refer to your owner's manual.

Apr 15, 2013 | Microwave Ovens

1 Answer

Microwave won't heat for first minute - starts working normally after that.


The magnetron may be defective. You can replace the magnetron, there is no other possibility.

Jan 16, 2013 | KitchenAid KHMC1857WSS Microwave Oven

1 Answer

Microwave will heat but not very hot 'even on 10 power


not something most average people are going to be able to fix, maybe the Magnetron.
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Dec 23, 2012 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Everthing works but won't heat


If turntable works suspect inverter (power) or Magnetron itself is bad.

Oct 29, 2012 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

My Oster OM1201eovg microwave will turn on but it won't heat what I put in there. What's the problem?


Either the inverter which powers things or the Magnatron which in effect does the heating are bad.

If a fairly expensive unit it may be worth repair as these are of course two of the more expensive parts in the unit.

Sep 04, 2012 | Microwave Ovens

1 Answer

Microwave won't heat


you have a power diode defective, high capacitor or Magnetron, test it for open with DVOM OR VOM , or better consult the qualified tech, Because this involve high voltage.

God bless you

Jul 10, 2012 | Frigidaire GLMV168K Microwave Oven

1 Answer

My morphy richards p80d20p-yu microwave runs normal but won't heat food


The problem is caused by a bad magnetron, inverter board, "7 years old or less" and possibily the keypad control board.

May 02, 2012 | Microwave Ovens

1 Answer

My Microsoft says H97 and won't start running and goes back to H97.


The "H97" error means that the microwave's inverter has shorted out and does not work any more. The microwave cannot transfer power to create heat, and the part has malfunctions and requires replacement. Use your microwave serial number and Panasonic customer service to find the proper part for the microwave.

Oct 05, 2011 | Panasonic Microwave Ovens

1 Answer

Microwave won't heat, timer goes off after 1 minute or so


Microwaves are a quick, convenient solution to the hassle of preparing and cooking hot dinners. They are popular appliances with students and large families where food often needs to be prepared fast. Microwaves use radio wave technology harnessed through an antenna, known as a "magnetron," to create friction between food or liquid molecules, causing them to heat up. Some microwaves can cease to function properly, resulting in the appliance running but failing to produce any heat.

  1. Magnetron
    • Magnetron tubes are often the source of heating problems in microwaves. Before having any repair work done, check the warranty on your microwave. Many companies offer 10-year warranties on magnetron tubes so you may be able to get it repaired professionally for free. Otherwise, unplug the microwave then remove the rear casing with a screwdriver. Locate the tube inside the microwave and check it for burn marks. A burnt tube cannot usually be repaired and will require replacement. A tube that doesn't appear burnt should be tested by a qualified technician to see if it can be repaired.
    High Voltage Capacitor
    • A microwave capacitor holds electricity as the appliance is running. A malfunctioning capacitor can lead to the microwave not heating, along with an irritating buzzing sound. Test the capacitor by first disconnecting the power then removing the wires attached to the capacitor. A capacitor with burn marks is usually damaged beyond repair and will require replacement. A capacitor can be tested by connecting each of the probes of an ohmmeter to the capacitor terminal. Each probe should provide a reading of infinity if the capacitor is working properly.
    Power Diode
    • The diode in a microwave oven is a one-way pathway that channels electricity from the capacitor. A malfunctioning diode can sometimes be the cause of a microwave that won't heat. The heating problem is often accompanied by a loud buzzing noise. You can test the diode by first unplugging the microwave oven, disconnecting the diode from the capacitor then measuring the level of electricity inside the diode with an ohmmeter. The ohmmeter can determine whether the electricity in the diode is flowing in one direction as it should. In most cases, the magnetron tube will have to replaced as well if the diode is damaged.
    Safety
    • Disconnecting the plug from your microwave to carry out an inspection does not guarantee safety. Even an unplugged microwave still has electricity running through its components, which can lead to severe electric shocks. Unless you have previous experience in dealing with electrical appliances, it is advisable to hire a technician to test component parts rather than undertake the job yourself. Anyone without a basic knowledge of electrical currents and safety should avoid testing components altogether.

Oct 03, 2011 | Microwave Ovens

2 Answers

Problem with the GE Spacemaker (JVM1640SJ) Microwave Oven GE Spacemaker XL1800 won't heat food anymore....It worked this morning, now won't heat. What should I do?


GE Will replace the magnetron for 9 years! Mine is a 2004 model with a one year warrently according to manual. HOWEVER they did say the magnatron was covered for nine years: call 888-239-6832. When I called they said thats all they get calls for and would send out in 3-5 days. NO CHARGE. I had to ask if there was coverage longer than a year on major parts and that's when they offered the info and I eventually was transferred to the right office. Saved $120 bucks on parts alone.

Jun 13, 2011 | GE Spacemaker JVM1640SJ Microwave Oven

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