I opened door while oven was heating, and microwave lost all power

Get the door safety interlock switches tested for continuity and alignment, by a qualified service engineer.
If a door switch is not switchimg. there will be no power to the magnetron and no heating.

Door switch is bad or a fuse blew out inside the microwave cover housing. Switch is most common.

The electronics have lost their marbles. When a nuker door is opened the safety switch connected to the door is designed to turn the unit off and not on. You just better work fast when you put stuff in or take it out!!!!!!!

I'd say the door interlock switch has failed, and supplies a connection when it should not. Microwave ovens can be dangerous to anyone poking around inside, even when unplugged, so get a quote from a service tech. You might find that parts+labour is almost as much as a new one.

Microwave radiation being released through an open door is also a hazard, as it is known to cause eye cataracts, so don't get near if the oven does this.

Hello


Power Supply

Check whether there is a proper power supply. Look to see whether the cord is connected to a grounded 3-prong outlet and the cord is fully plugged in. If the electrical system is built-in and no power cord is visible, replace or reset the household fuse or circuit breaker.

Microwave Functions

Some basic microwave operational steps may affect whether the microwave is heating. Open and close the microwave door, as the unit will not function with the door open, and push "Stop/Clear" to cancel any previous settings, such as the timer, which do not heat the microwave oven.

Setting the Microwave

Once the power to the microwave has been reset, or verified as working, and the microwave is ready to run, select a new cook cycle and press "Start" to see if the microwave begins to run and cook food as expected. Allow the food to cook for the alloted time and then open the microwave door and check to see if the food has cooked or heated. Choose a longer cooking time and restart the microwave if food is heating but is cooking slowly.

Repair

If all efforts to troubleshoot the function and power to the microwave still do not get the appliance heating food as expected, there may be a repair issue that needs to be addressed. Contact professional technician for advice.

Hi,

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

Basic Microwave Oven Troubleshooting Tips

heatman101

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Replace the magnetron and the wave guide.

You have a fuse in the back that's problem is blown

yes !! check the micro switches where the door latches , you have to open the microwave to check inside if switches are in their place or broken . hope it helps