Roborock H6 Handheld Vacuum Cleaner Burning Hot
This handheld vacuum cleaner is our personal one, so despite regular reminders (that’s what we’ll call it…) from my wife, it was some time before it reached the top of the list. She assured me that I would have to use it before I could start to diagnose the fault. I personally feel that it was just a way to get me to do the vacuuming! Either way, as usual, she was right. After less than 5 minutes, it was impossible to hold the handle, let alone continue with the vacuuming!
I thought this was the perfect opportunity to use my thermal camera, as with all that heat, it could be difficult to isolate the actual cause of the heat.
Unfortunately, I didn’t get a photo of the culprit, so you will just have to take my word for it. As I mentioned, in less than 5 minutes, the temperature rose dramatically. I have seen some extremely high temperatures over the years in electronics and electrical circuits, but nothing could prepare me for what I saw. So much so, I had to check several times to confirm what my eyes were seeing. The temperature reading on the thermal camera reached 181˚C!
After removing the handle cover, which housed the control electronics, I was able to see the various components easily. I was sure that this reading was incorrect, but at least it focused the extreme temperature of the positive lead going to the motor from the battery.
The lead is just crimped onto a side entry, non-insulated, crimp terminal. To inspect it, I opened up the crimp to examine the wire closer. I could see that the positive wire was discoloured compared to the negative wire terminal.
After removing the terminal, I could see that the wire to the terminal had a huge voltage drop. How could I tell? When I cut the wire back to create a better contact point, I could see that the wire had been so hot that it had turned blue! That’s not corrosion you see – the wire had actually overheated so much it had turned blue. This is something I have never seen before. So the temperature reading of 181˚C I saw originally was correct after all.
I wasn’t sure if this was the only failure point, so I decided to solder the end of the wire here, reinstall the crimp terminal, solder the two together to ensure no voltage drop would be created and then measure the results.
This time, I ran the vacuum cleaner until the battery was almost flat and then measured the temperature of the wires at that point. A much more reasonable 35.9˚C was shown on the positive lead. I could see a higher 46.6 ˚C on the negative terminal, so you guessed it, this crimp terminal got the same treatment with excellent results.
This now showed, after another 5 minutes of vacuuming (the whole house is nearly done at this point – my wife is very smart…) that the temperatures at both the positive side (41.1) and negative side (37.5) are almost equal, indicating only minimal voltage drop in the circuit.
The handle could now be comfortably held without any excess temperature to interrupt the fun-filled vacuuming experience.
So, not only did my wife get the vacuum cleaner fixed, but also got the vacuuming done around the house. She considered that a win, win situation.
Sorry guys, no video this time.
This article was prepared for you by Mark Rabone from Australia.
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Note: You can check out his previous repair article on The LG Flashing Monitor
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Tayo
August 28, 2024 at 11:58 am
Very confused what the actual cause of the voltage drop was...
Mark
August 28, 2024 at 2:19 pm
Hey Tayo,
As mentioned in the article, the poor connection at the crimp terminal was responsible for the voltage drop, that's why it was creating so much heat. I soldered it in place, to increase the connectivity of the connection, reduce the voltage drop at that point and therefore lower the temperature.
Albert van Bemmelen
August 28, 2024 at 2:37 pm
Nice job Mark! But sadly no video you showing vacuuming the house? LOL!
Mark
August 29, 2024 at 5:24 am
I'm afraid I was too focused on the job at hand. You will have to take may word for it. The house is now clean due to the fact that my wife is smarter than I am!
Parasuraman S
August 28, 2024 at 4:56 pm
Ha! Ha! I almost broke off my tummy (just filled it with lunch of Curd Rice)! Very nice experience! Wives are very clever nowadays and we can hardly beat them in their games! I never knew that a bad connection can heat things up to this level! Very useful share!
Mark
August 29, 2024 at 5:27 am
I only realised halfway through the vacuuming what she was up to, but sadly it was too late, I had done most of the house. She's a very smart lady! Yes, I was totally surprised about how much heat was produced. I have never seen anything like this before.
Yogesh Panchal
August 28, 2024 at 6:27 pm
Good Job! Mark
Perfect caught the culprit, I agree loose contact of electric wire cause overheat few years back i found my geyser socket is melted because of loose contact of the plug.
by the way who has done vacuuming the house finally??.....Ha..ha..ha...
Mark
August 31, 2024 at 4:54 pm
I was so surprised when I saw the temperature reading. I didn't think it would be possible to be that hot - but the thermal camera proved it several times. Yes, I finished the vacuuming. Not the first repair of a vacuum cleaner in our house where I have been tricked into doing all the vacuuming. She's a smart lady!
Mark J
August 28, 2024 at 11:51 pm
Good job on the fix.
Mark
August 31, 2024 at 4:55 pm
Thanks Mark
Mark
August 29, 2024 at 5:30 am
Unfortunately, I had to finish the vacuuming........proving the repair was complete. I recently repaired our clothes dryer and dishwasher as well. What other household appliance will break down next? I'll have all the housework done soon!
Waleed Rishmawi
August 29, 2024 at 2:49 pm
interesting fault but I am glad it got fixed. now you can help your wife cleaning the house as you test the machine for more faults. LOL. have a blessed day
Mark
August 31, 2024 at 4:56 pm
I'm sure she'll find fault with some other appliance to get me to do the work as I 'test' it's operation!