Fault microwave not heating,

Un-plug the product & remove the top cover,HV diode is reversely grounded with the capacitor remove thimble from capacitor & un screw the other side of diode from the body,replace the new one with same type.

There is no microwave, so I suggest to check all HV components (magnetron, HV reactifier diode, HV fuse or protect diode, HV capacitor and eventually transformer).

Dado

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.
     

Sorry to read about your problem, I hope this helps you out.

Here are some problems you can have

1. Blown fuse in HV transformer primary circuit or HV fuse (if used).
2. Bad connections (particularly to magnetron filament).
3. Open thermal protector or thermal fuse.
4. Open HV capacitor, HV diode, HV transformer, or magnetron filament.
5. Shorted HV diode, HV capacitor (will blow a fuse), or magnetron.
6. Damaged protective VDR from filament to chassis (not commonly used).
7. Defective HV relay (not commonly used).

Microwaves must be serviced by technicians due to the inherent dangers involved in repairing these appliances. Internal capacitors can retain a lethal electrical charge even though the unit is completely unplugged. A microwave radiation leakage test must be performed on the unit following any internal component repair.

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If the operation is otherwise normal with the exception of heating food, common causes include; (to diagnose requires discharging of the HV capacitor) if you are inexperienced with working with HV I suggest seeking professional help.

Open thermal protectors or thermal fuses.

Open HV Diode.

Open HV capacitor

Open magnetron filament

Open winding in HV transformer

Defective HV relay

Shorted HV diode

Short or other fault in the magnetron

Short in certain portions of the HV wiring

Replacement Magnetrons (the most likely cause if not charring or defective components are found when troublshooting the small parts, can typically be had for around $45.00 just do a web search for your model number.

Good Luck

When you say "Everything works as set" do you mean the microwave appears to function properly, but then doesn't heat?

If the magnetron is new, then the magnetron must not be receiving the required high voltage (2000V or more) from the HV circuit. Make sure you've got 120V to the PRIMARY (don't attempt to measure secondary voltage of the HV transformer without special equipment) of the HV transformer. After that check the HV capacitor and diodes. If these components test OK, then either your HV transformer is bad or your new magnetron is faulty. My experience is that the problem is usually in control circuitry, preventing 120V to the HV transformer, or opens/shorts in the HV components (diodes and capacitors).

The most common problems of microwave oven are the HV capacitor, HV diode and lastly the magnetron which is the main part of M O. check the capacitor and diode first, if its okay, then you have a decision to make. replace the magnetron or the whole unit. magnetron are costly

You've got a problem in the microwave circuit, which could be one or more of the following components -

1) HV diode
2) HV Capacitor
3) HV transformer
4) Magnetron

I am leaning to the diode, but it would take further investigation to determine for sure. Diodes are cheap, as if the capacitor, and replacing those first would not necessarily be in vain if it turns out to be the transformer or magnetron. And I would be most inclined to say it's the magnetron before I would think transformer.

Reply back what you find or if you have more questions.

Fixed it. There was a back capacitor fuse (I believe that's what it's called) on the old magnetron. I removed it and put it on the new magnetron. The HV diode is on the big silver capacitor and very easy to replace. I just didn't see it. It was definitely the magnetron and I hope that this new one comes with a warranty for 5 more years.

If you feel comfortable doing so, you may want to check the capacitor. Burning odors however are usually caused by either the magnetron or HV transformer.