On closing the door, the microwave does not start. The timer winds down. On opening and closing again, it works. I have replaced the latch on the door. Therefore the trouble seems on the closing switch.

Repaired latch inside door, but when I close the door the light stays on and reads close door
How To Fix A Stuck Latch If your door can open correctly but can't close without getting stuck, it's likely an issue with the latch. Multiple issues can compromise door latches, such as a mechanical error, worn down latch components, broken door handle cables, and more. If the latch is simply stuck, you should be able to fix this yourself without taking your car to a mechanic. Just take some oil lubricant, like WD-40, and spread/spray it into the latch mechanism of your open door. Let the oil soak in for a little bit, then use a microfiber cloth to rub the oil into any visible parts of the latch. While performing this task, check to see if you can find any rust on latch components. If you do, use a piece of steel wool to scrape the rust away. Once removed, try opening the latch with your door handle to confirm that it is once again functioning correctly. In some situations, your latch may accidentally be closed when it should be open. This can happen for multiple reasons - sometimes due to an electrical glitch or a mistake made while repairing the door. Either way, if you have a car door with a closed latch, try opening your door and looking at the latch to determine its orientation. Then, open a functional door and look at the latch to see how it's supposed to be. A working door will have a latch with "open" jaws. These jaws can catch the door jamb anchor and rotate into a closed orientation to secure the door. If the latch's jaws are already closed, it can't engage with the anchor or close properly. To fix this issue, take a screwdriver and hold the door handle in the open position (pulling if necessary). As you pull the handle, rotate the latch with your screwdriver into the correct orientation. If needed, ask a friend or family member to help you hold the door or hold the handle open for you while you perform this action. Once you have moved the latch into the correct orientation, test the door handle a few times. The latch should open when you pull the door handle, and the door should again be functioning correctly.

follow this steps and fix it. God bless you

1. Open leverCheck your microwave lever to determine if it is damaged. If it is broken, simply replace the lever to get your microwave door fully functional again.
   
2. Door springResponsible for keeping downward pressure on the door hook, the microwave door spring can begin to malfunction. If this part is broken and prevents you from opening your microwave door, replacement is necessary.
   
3. Door latchOne reason your microwave door may not open properly is a broken door latch. Located inside the microwave, the door latch manipulates the door hook to keep the door closed for safety and top performance. If broken, the door could become stuck in the locked position.
   
4. Door hookIf your microwave door will not release properly, the door hook could be damaged. Located inside the door, the door hook is made of plastic and prone to breakage with extended use or age. As this part is unable to be repaired, the only option is to replace it.
   
5. Button or button springIf the microwave door will not open, it could be an internal failure of the button or button spring. If it is determined that either of these parts is the source, both are replaceable and it is recommended that they be installed at the same time.
   
6. Handle actuatorIf the microwave door will not open the plastic handle actuator could be broken. Connected between the door button and the door latch assembly, this plastic part could become damaged and brittle over time, which makes breaking inevitable. If this occurs, replace the handle actuator to get your microwave fully functional again.
   

Read more: http://www.appliancepartspros.com/repair-help/microwave-repair-help.html#11#ixzz2gPqmd5pf
http://www.appliancepartspros.com

follow this steps and fix it. God bless you

1. Open leverCheck your microwave lever to determine if it is damaged. If it is broken, simply replace the lever to get your microwave door fully functional again.
   
2. Door springResponsible for keeping downward pressure on the door hook, the microwave door spring can begin to malfunction. If this part is broken and prevents you from opening your microwave door, replacement is necessary.
   
3. Door latchOne reason your microwave door may not open properly is a broken door latch. Located inside the microwave, the door latch manipulates the door hook to keep the door closed for safety and top performance. If broken, the door could become stuck in the locked position.
   
4. Door hookIf your microwave door will not release properly, the door hook could be damaged. Located inside the door, the door hook is made of plastic and prone to breakage with extended use or age. As this part is unable to be repaired, the only option is to replace it.
   
5. Button or button springIf the microwave door will not open, it could be an internal failure of the button or button spring. If it is determined that either of these parts is the source, both are replaceable and it is recommended that they be installed at the same time.
   
6. Handle actuatorIf the microwave door will not open the plastic handle actuator could be broken. Connected between the door button and the door latch assembly, this plastic part could become damaged and brittle over time, which makes breaking inevitable. If this occurs, replace the handle actuator to get your microwave fully functional again.
   

Read more: http://www.appliancepartspros.com/repair-help/microwave-repair-help.html#11#ixzz2aSkJuabC
http://www.appliancepartspros.com

"There is some charring around one of the interlock switch terminals"

You have a bad connection. The connector and the switch it goes to should be replaced.

Our help file on door switches is here.

You can download GE owner's manuals and installation instructions here.

You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Hi dschema,

You have a door switch issue. There are three behind the panel. If you can lift and hold the door and it starts one of them is bad for sure. You would be better off replacing all three or have a repair man replace them because a microwave can hold 3000v even unplugged.

Hope it helps.

Thank you for using FixYa.

Do not pry the door open since there is an easier remedy which will lead you in the direction that you need to fix your problem. Take the cover off after you disconnect the power to it. Once you have taken the cover off (only a few screws) you will be able to see the two latches that hold the door closed and the link that opens both of them. You can just lift both latches at the same time and it will open. After you have done that take a good look and press in on the open door button and you will see where you have the problem of the door hanging. That button should push a linkage that pushes up on both latches at once to open the door. It is spring loaded so that it comes back down so that when you close the door it will hold the door close.You need to take the cover off the microwave so that you can pull both of the latches that hold the door closed up. When you push the button in it engages a linkage that pushes both taches up at the same time to open the door. It is springloaded and will come back down during normal operation to hold the door closed when you close it again. That area is where your problem is. By looking at what happens when you press the open door button you should be able to readily see where the problem lies in that linkage

Mine also does the same thing however I only need to lift the door upwards slightly (after it's closed) and it engages the High Voltage Transformer, thus working as normal.

Once you know that, you can get it to work every time. I beleive the clips on the door don't properly stop latch in correctly and the safety feature keep the microwave from acutally turning truly "ON".

You need to replace the whole door latch with an original part.

If it is working but not heating, then test the high voltage capacitor,the rectifier diode.or the magnetron. If all this are fine, test the control board.If turntable is not running check also the door switch.

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.

You can also order from MicrowaveSvc , they also provide parts.

You need to trace the power feeding the high voltage transfomer. Because the table doesn't turn, it implies that a door switch or safety interlock is the problem.