We are sorry to hear that, can you send us a private message with full serial number?
For other that might be having this issue:
Mine has the same issue. My model is SMH1713S. It started doing it years ago. I'm technically inclined so I looked into it. It seems the relay switch in the control panel that engages the magnatron is faulty and tend to gets stuck in the "on" position. I found a flat palmed smack on the panel is a good temporary solution. However, don't rely on this long term because if you leave your food unattended it can be dangerous. I never got around to fixing it myself but the problem has been more frequent so I am in the process of doing so.
Give it a good smack as a temporary fix, then get it fixed.
Well reading all these issues doesn't give me a whole lot of reassurance but our microwave is now doing the same thing. If door is closed it just keeps running. Currently unplugged. Only been installed for about 2 years. Model ME18H704SFS
Our sincerest apologies for the frustration and inconvenience that has caused. Please feel free to send us a private message so that we can look into this for you. LINK
Hello, today my house almost went on fire after the microwave started running by by itself with a box of donuts inside. Glad I was at home, and the smoke and the smell made me run to the kitchen, this is a serious issue with this microwave. Now waiting to see how can this be solved.
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I'm sorry to hear that, can you send me a private message with your email address so that we may look into this for you?
Ours is doing samething. Would think Samsung would correct this problem with there being so many complaints on same issue. I truely believe this could be a fire hazard? If someone walked away not hearing the buzzing sound for many hours it could catch fire easily? The inside gets so hot you can not touch the glass plate and, it only took seconds for it to get that hot? I can imagine if left over night?
My microwave is doing the same thing. Model HE18H704SFG. Lound humming noise witht the door closed. Is there a fix out there?? I havent been able to find much on the web. What I did find seems to be pointing at the magnatron.