very poor suction on 860

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very poor suction on 860

Postby zak » August 18th, 2017, 10:58 am

I have a fairly new Roomba 860 that is not picking up debris. If it runs a full cycle, there is some dust in the bin, and I can feel a lot of air blowing behind the bin as it's running. The "brushes" are spinning (at least a little -- I marked them with a pen, and marks are in a new place). But any visible debris, even small crumbs on either tile or carpet, get left behind. I'm at a loss...

I did disable the cliff sensors, so it would run on my dark rug, by placing the two sensors in each box next to each other (http://www.pottsland.com/roomba/Roomba_ ... ensor.html). But everything went back together and it runs as if nothing is wrong -- it's just that there's still lint and crumbs on the floor when it's done! Maybe I did something very bad during the modification? I did the same with an older roomba years ago, without trouble...
I'm not certain if the performance got worse after the modification or if it is complete irrelevant, since I did this almost as soon as I got the Roomba.

Any thoughts would be most appreciated!
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Re: very poor suction on 860

Postby a1robotrepair » August 18th, 2017, 11:33 am

Once the extractors, brushes, get smooth, worn, the bot won't pick up very well. You could also run the BITs to test the CHM.
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Re: very poor suction on 860

Postby zak » August 18th, 2017, 11:53 am

Thanks. The Roomba has only been run maybe 15-20 times, and the rollers (and everything) still look new.
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Re: very poor suction on 860

Postby vic7767 » August 18th, 2017, 12:07 pm

zak wrote:Thanks. The Roomba has only been run maybe 15-20 times, and the rollers (and everything) still look new.


a1robotrepair wrote:You could also run the BITs to test the CHM.


Did you run the BiTs (Built in Tests) and watch the CHM (Cleaning Head Module) brush deck extractors spin?
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Re: very poor suction on 860

Postby zak » August 18th, 2017, 1:00 pm

I haven't yet -- was hoping the info about it being new would change the recommendation. But I will try it as soon as I figure out how to do that! I'll wade through google results unless someone has a link handy...
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Re: very poor suction on 860

Postby a1robotrepair » August 18th, 2017, 1:18 pm

If it's under warranty, call Irobot. The bits are identical to the 500 series except there are 2 extra, rear cliffs and bin sensors, and 3 are skipped, the charger plugged into the bot tests. You can find the 500 R3 BITs in the 500 series service manual, a copy of which is under the thread "Roomba & Scooba Info Fixes and Mods".
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Re: very poor suction on 860

Postby zak » August 18th, 2017, 1:39 pm

Thanks! I put iRobot out of my mind since I voided the warranty when I disabled the cliff sensors, but I should have considered that it might possible to get support without them knowing that! I'll try the BIT and see what iRobot can do from there. I appreciate both your help.
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Re: very poor suction on 860

Postby a1robotrepair » August 18th, 2017, 3:16 pm

Just put it back to original before returning. A battery reset resets the no of service tests and battery data, bbox vars.
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Re: very poor suction on 860

Postby Brett » August 18th, 2017, 10:01 pm

BiTs will tell you, but quicker is when it's running slide your hand under the rear of the Roomba and feel if the extractors are turning. Then you know.
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Re: very poor suction on 860

Postby JackMayyam » August 23rd, 2017, 2:25 am

same here. I find everything about Roomba 860 amazing, except for its suction. It really doesn't have that much force when it comes to suction. I also read here that the most recent Roombas have stronger suction power compared to the 800series. I hope this gets to improved though
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