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Mike
November 11, 2021
About 5 months ago my microwave stopped working, I removed the covers and found one of the two fuses was blown. I replaced the blown fuse and everything worked well until 3 day ago when the unit again stopped working. Again I found a fuse had blown and replace however the fuse immediately blow when I engage the main breaker. Now with good fuses installed when I turn on the main breaker the breaker immediately trips. Please note the microwave is part of a combination controlled from the same breaker(s) the oven works fine with the microwave fuses not in circuit. Please help, thanks .
For model number HMC80251UC
Hello Mike, Thank you for the question. This is normally an indication one or more of the Door Switches are defective and causing the surge to trip the breaker or blow the fuse. They can be tested with a Multimeter to check if they are reading Normally Closed or Normally Open. We hope this helps!
About 6 months ago the microwave lost power. I took it apart and found that one of the two 20A fuses blew. I did some research and saw that the door switches were a common issue. I checked all 3 switches with a multimeter and found they all worked perfectly, opened and closed. I put it back together with a new fuse, and it worked fine. Now, 6 months later, it stopped working again. Same problem - blown 20A fuse. I checked each door switch again with a multimeter and had the same results - they work fine. Are there any other issues other than the door switches that would cause the 20A fuse to blow? Thanks!
For model number HMC80251UC
Hi Tom, thank you for reaching out. If a microwave fuse keeps blowing, it may be because the fuse is not being installed correctly. The most common cause of a blown fuse is when something draws too much power from the circuit. This is most often caused by either too many lights or by using too many plug-in appliances at once. A power surge may also cause the microwave’s main fuse to blow. Experimenting with other power outlets may reveal an issue with the power outlet or electrical wiring that is causing fuses in the microwave to blow. We hope this information is useful!
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John
January 7, 2024
Replaced assorted parts including tray motor and new tray . now tray turns for a while and stops.Very remote customer!
For model number HMC80251UC
Hello John, thank you for reaching out to PartSelect. If the turntable is not installed correctly inside your microwave, it may not spin, and you might hear a thumping or rumbling sound from the appliance. Make sure the turntable is placed right side up and securely on the turntable support hub. Many microwave turntables sit on a roller track to aid in rotation. These roller tracks sit on small wheels that can become blocked by obstructions on the bottom of your microwave. Make sure that the microwave interior is cleared of any packaging material, food or debris that can prevent the wheels from moving freely. If this does not help, we would recommend replacing the drive coupling, part number PS8770347. Good luck with the repair!
after replacing parts including fuses, turntable, door switches and another sensor, the microwave will operate, turntable will turn, light is on, when suddenly the turntable stops. i am afraid to let oven continue so I turn it off. Could it be that if I am heating water, the moisture sensor is turning microwave and turntable off until the fans reduce moisture in cabinet?
For model number HMC80251UC
Hi John, thank you for getting in touch. We would recommend checking the temperature regulator, part number PS10060775. It is a safety device that shuts off the microwave if it overheats. You may need to replace it to fix the issue. WE hope that helps!
Why does the microwave trips the breaker when the door close?
For model number HMC80251UC
Hello Hugo, Thank you for the question. This normally indicates one or more of the Door Switches are defective and will need to be replaced. We hope this helps.
I installed a new right hinge (PartSelect part number PS10060784), since the integrated return spring failed. To remove the door, I made two of the special tools required in the Bosch repair manual. I fabricated two square pieces of aluminum, about 30mm on a side and ¼” thick. With the door open (it is horizontal) you place one square in each of the cavities that the hinges close into and close the door far enough that the squares take up the force of the springs and allow you to lift the door out. Of course, if one spring is broken, you will not need a square on that side to remove the door but will need it later to install the door with the new hinge. In fact, I installed the square in the replacement hinge before I installed the hinge in the door. Next remove the ventilation duct (Part number PS8770410). There are three screws. When re-installing the duct later, do not overtighten the screws, because they can pull through the duct. This will require longer screws and small flat washers to repair (‘don’t ask me how I know’). The next step is to remove the plastic cover (PartSelect part number PS11705124). It will be impossible to save the plastic cover (‘don’t ask me how I know’). Purchase a new one ahead of time. It will be easier to not scratch the door if you recognize that you are going to destroy the cover. When removing the plastic cover, pieces of some of the tabs that hold the cover in place will break off. The broken-off pieces of the tabs that fit into cavities at the top of the door may remain in the cavities. IF YOU DO NOT PICK OUT THOSE PIECES, THE NEW COVER WILL NOT SNAP HOME DUE TO THE PRESENCE OF THE BROKEN PIECES. You will break the new cover in removing it to figure out why it wouldn’t snap home and will have the pleasure of purchasing a second new cover (‘don’t ask me now I know’). Also, when removing the cover try not to bend the metal fingers of the frame (part number PS8770415), particularly along the top of the door. It is important that the gap between the metal fingers and the frame holding the glass be correct, since that is where the seal (part number PS10061106) must fit when replacing the cover. On the other hand, if the metal fingers are bent too far away from the frame holding the glass, the cover will not line up with the cavities along the top where the tabs go home. It will be easier to protect the metal fingers if you recognize that you will be destroying the cover when you remove it. I did pinch and damage the seal when trying to force the first new cover in place (it didn’t go home, as described above), and had the pleasure of purchasing another seal (currently unavailable). You only get one chance per cover. Once the cover is removed the frame can be removed from the outer door by removing the screws holding the two parts together.
Next, replace the spring.
Next re-attach the frame to the outer door.
Next, be sure the seal is positioned correctly on the cover. The seal has a flap that holds it in place on the cover, such that the seal will be pulled into place when installing the cover. This is essential, since you will not be able to reposition the seal once the cover snaps home (particularly along the top of the door).
Now, carefully position the cover so that it is going to remain parallel with the door when you push it home. You do not want the cover to be cocked, since the seal may not install correctly. Be sure all the tabs are falling into place as you install the cover. Hopefully, the tabs will all snap into place and the seal will stay in place.
Replace the door by feeding the hinges into place with the squares still installed. Open the door fully and remove the squares. The door will close correctly if the hinges are placed correctly. This may take several tries.
Finally, microwave yourself a fresh cup of coffee or other beverage.
This door is not meant to be repaired, in my opinion. I believe Bosch offers only the option of buying a new door. A DIY repair is not risk free.
Replaced the wave cover. Unscrewed existing cover that is at the top inside the microwave. Screwed in the new cover. Took about 30 seconds to do. Bosch service wanted over $100 for a service call plus parts and labor. Did it myself in seconds for under $10.
Pulled out the old piece after removing turntable and put new piece in. Then put turntable back on top. It's a $9 part and I probably saved at least $200.
