Microwave not powering up but heating

If your Miele H6800BM microwave is no longer heating food and there is a noticeable change in its operation, it is likely that there is a malfunction or component failure specifically related to the microwave function. Here are a few potential causes for the issue:
1. Magnetron Failure: The magnetron is a crucial component responsible for generating the microwave energy that heats the food. If the magnetron has malfunctioned or failed, it can result in the microwave not heating.
2. High Voltage Diode Failure: The high voltage diode in the microwave circuitry is responsible for converting the AC power supply to the high voltage DC power required by the magnetron. A faulty diode can prevent the magnetron from receiving the necessary power and thus lead to no heating.
3. Faulty Capacitor: Capacitors in the microwave circuit store and release electrical energy. If a capacitor associated with the microwave function is defective, it can prevent the microwave from generating the required power for heating.
Given the symptoms you described, it is likely that there is an issue with one of these components. It is recommended to contact a qualified technician or the manufacturer's customer support to inspect and repair the microwave. They will have the expertise and necessary equipment to diagnose and resolve the specific problem with your Miele H6800BM microwave.

hi , now that's either power supply to power the magnetron or the magnetron itself ...

Regards
Rob

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.

The light inside the micro wave needs to be replaced most have a door on the back side that yo can remove the screw and unscrew the bulb and take to a applince shop and purchance a new one to replace.

he failed heating device is called the Magnetron. if the entire microwave oven is inoperable and, it will not power up when plugged in, this will be a failed power board or fuse. Now, if the microwave works and the fan blows but, here is just no heating, this will confirm Magnetron failuer.

If the microwave oven appears to be working but it is not heating the food, it is very possible that the magnetron, or its power supply has failed.

Jerry G.

If you have the experience with discharging a capacitor and you have a (VOM) Volt Olm Meter. Unplug microwave, discharge capicitor, and check the resistance of the two thermal cut-off discs by removing the lead and set VOM to RX1. If you don't get a reading of zero, replace the discs. If you found any of these suggestions helpful, please rate my solution. D. Lange

First: never attempt heating pure water in a microwave, that is dangerous.

Ensure the oven is not set to the minimum power, otherwise the heating will be minimal.

Try heating some food at maximum power for two or three minutes, if it does not heat, take it back to the shop.

About water in the microwave, see here:



Microwaved Water - A MUST see

Superheating of water

It sounds like the magnetron failed.
Check this link for more info and maybe a way for you to test it for functionality. If you are uncertain on what and how to do it, I would suggest to take to a repair tech.