No power to microwave - Vacuums

Hi,
Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101

Check to make sure that a circuit breaker hasn't been tripped in your breaker box. If that's not the case, you can pull the microwave out and check the back for a fuse. Generally fuse access is located next to where the power cord enters the device.

If there is no heating please do not switch on unless you have confirmed the fault. It is possible that the Magnetron is faulty, the temperature cut off is faulty or the main capacitor is short. It is also quite possible that insect can get into the oven and create soft spots. When you switch on these will create a short and make the voltage jump and in the long run damage the magnetron.
So Remove cover after disconnecting , check for dirt/moisture in the cabin, if so wipe clean and dry, check the magnetron and area clean and use an jet air to clean off.
Make sure that the program controller is working if not check power - step down supply, the pads are responding- if not faulty pads- or the door switches, if contact is not through the microwave will not work.

Now keeping clear of the microwave, switch on, use a cup of water inside to test.
If you notice any sparks shut off as the magnetron or the main HT capacitor can be faulty. replace with same type.
If there is heating without any issues, you can use the microwave safely

You may have a short circuit on the INTERIOR LIGHT BULB circuit in your microwave.

This might explain why the breaker trips every time you open the door.

If so, you would have to unplug and disassemble the unit in order to access the wires and light bulb socket inside the case in order to troubleshoot and repair the problem.

If you are unfamiliar with safe electrical troubleshooting and repair procedures, please be extremely careful or consider hiring an electrician to do the work. There are some hazardous components inside which remain dangerous even after the unit is unplugged.

Good luck.

Hello,

Investigate these three areas if your microwave won't heat

Power Diode

A diode is an electronic component that readily passes current in one direction only and blocks the flow of current in the opposing direction. If your microwave's diode has become defective, your microwave will not heat and you will hear a buzzing noise. Test the diode to determine if this is the cause of your problem. Replace it if it is defective.

Testing a diode

NOTE: Before you test your diode, make sure your microwave is unplugged, and that you discharge the microwave's capacitor.

Whether it is shorted or open, a defective diode will most likely show some sign of defect. Defective diodes will usually emit an electrical burning smell, signifying its defectiveness. Also, it may have split in two, or it may exhibit a burned crack, or possibly even a blistered spot.

A shorted diode is indicated by a loud humming noise from the high voltage transformer, and no heat produced when a cook cycle is initiated. Whereas little or no heat produced in your microwave, with an absence of a humming noise is indicative of an open diode. In either case, the diode has to be replaced.

With your microwave unplugged, and your capacitor discharged, use extreme caution to remove the lead that leads to the capacitor. You can leave the ground connection attached. The side of the diode that goes to the ground is usually marked with a dot, stripe, or arrow. Set your ohmmeter to R x 10,000 or higher. Touch the positive meter probe to the anode and the negative meter probe to the cathode to measure the resistance across the diode terminals. Remember that the cathode is on the side that goes to the ground, which is often marked by a dot, stripe, or an arrow.

A normal diode, that is a non-defective diode, will read anywhere from 50,000 to 200,000 ohms. Differences in microwave make and model account for this large range in resistance readings.

Reverse the meter probes and measure resistance while touching the positive probe to the cathode and the negative probe to the anode. Reversing the probes like this should result in a reading of infinity. Unless a bleeder resistor is present. The presence of a bleeder resistor would produce a reading of the value of the resistor.

High Voltage Capacitor

A capacitor is an electrical device which stores electricity. A defective capacitor may be why your microwave is not heating but you are hearing a buzzing or humming noise. The capacitor will have to be tested to determine if this is the cause of your problem. A defective capacitor will have to be replaced before your microwave will work again. Make sure you discharge the capacitor before you test it, though.

Magnetron

A defective magnetron is the third possible cause of why your microwave is not heating, but you can hear a buzzing noise. Test your microwave's magnetron. Replace it if it is defective.

Testing a magnetron

NOTE: Before you test this component, make sure your microwave is unplugged, and that you have discharged the capacitor.

There are two tests to conduct in order to determine whether or not a magnetron has become defective. If you receive results other than what are detailed below, you will have to replace your microwave's magnetron. Each test is described for you here:

TEST 1: Locate your magnetron and label each of the wires attached to it so that you know which wires are to be replaced where. Set your ohmmeter to the lowest resistance scale. Take a resistance measurement between each of the magnetron's terminals by touching each probe to one terminal each. Reverse the probes and take a second resistance measurement. Each measurement should read less than one ohm.

TEST 2: Set your ohmmeter to its highest resistance scale. Touch one of the meter's probes to a magnetron terminal. Touch the other probe to the metal magnetron housing. Take special caution to not touch the two probes together. This could result in an inaccurate reading. This test should produce a reading of infinity - indicating an open circuit.

Read the tips on the below links on how to replace your microwave oven's diode and how to discharge the capacitor.

http://www.fixya.com/support/r7088355-replace_microwave_ovens_diode

http://www.fixya.com/support/r7088317-discharge_microwave_ovens_capacitor

I hope the above is helpful.

Good luck.

Remove the plug from the power point and make sure that you completely dry the inside of the microwave with a clean dry cloth , keep the door open for drying. If by any chance the liquid or the water has seeped into the magnetron port then it might have clogged and damaged the unit.
Please check this section inside the chamber and dry this soft spot fully before you can try to switch on the microwave.
If this wont work then check the fuse inside the unit and the thermal cut off switch if this has tripped.

Hi,

Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Microwave Oven Basic Troubleshooting Tips

heatman101

the safety switch is burn or broken.

also check for roaches they like to hang inside a microwave, you be surpise that you might have no roaches, i said the same thing, til i found a few.

anyways, how old is the device if it like 4 years old might be curcuit board going bad.

touch pad might be bad. usually be better to buy another microwave then to get it replacable pad.

I’m happy to help further over the phone at https://www.6ya.com/expert/david_92c86cbc79e9b552

If there is no responce on 2 or more buttons, the board is certainly in need of replacement. Normally one button indicates the toutchpad. Need to put on a surge plug to remove unstable voltages.(In S.Africa, we call the protection plugs "surge plugs").

Hi,

1. Push the power cord all the way into the outlet in case it became loose and is causing the problem. If the microwave still isn't working, check for a blown circuit fuse, and repair it.
   
2. Step 2 Check that the controls on the microwave are programmed correctly according to the owner's manual. If they aren't, program them.
   
3. Step 3 Close the microwave door firmly. Touch the cook function on the Start Pad, not the timer. Check if the microwave works. If not, continue to step 4.
   
4. Step 4 Program the Power Level correctly. If it's not programmed properly, the microwave will cook the food too quickly or too slowly.
   
5. Step 5 Use only microwave safe dishes. Make sure food is evenly shaped and defrosted before placing it in the Amana Radarange microwave.
   

Thanks.
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