Roomba Brush Not Spinning? (A Guide to Solve This)

You’ve been working hard on maintaining your household, and your Roomba has been working just as hard to ensure it’s clean. That is, until the day you notice that your Roomba isn’t picking up the dirt anymore – instead, it seems to be sitting in one place, moving around in an aimless circle.

You check its dustbin and see that it still has plenty of space left to hold more dirt, so you know it must be something else causing this problem…and later, you discover that the side brush isn’t spinning.

Your Roomba brush isn’t spinning because

It is clogged with hair or tangles. Yes! That’s the primary reason. Aside from this, a jammed side brush module, worn-out motor or Roomba’s internal software malfunction can also trigger this issue.

However, the following are the reasons your Roomba’s brush isn’t rotating correctly or stopped spinning completely.

  • The Brush Module is Jammed!
  • The side brush motor is poorly lubricated!
  • The side brush module is damaged!
  • The brush is tangled with hair or debris.

To troubleshoot if your Roomba brush isn’t spinning

Make sure the brush is dirt and tangle-free and is not obstructed in any way. If the brush doesn’t spin after clearing hair and tangles, clean the gearbox module and apply some WD-40 to it.

Here is a data table informing the reasons and the solutions in simple words!

Reasons Solutions
Tangled side brush Untangle the brush
Jammed Gearbox Clean the Gearbox
Poorly lubricated Gearbox Lubricate the Gearbox
Damaged brush Module Replace it

Step 1: Untangle the side brush.

No need to mention again: while cleaning, a lot of hair and debris get caught up in the side brush, and if not cleaned regularly, it will prevent the brush from rotating. Additionally, You might discover that your Roomba is producing excessive noise or a high-pitched squeaking sound.”

Here’s how to clear hair and tangles from the side brush:

  • Remove the Screw: Use a Phillips head screwdriver to remove the screw that holds the side brush in place.Unscrew the side brush
  • Clean the side brush: Carefully remove the side brush and use a pair of scissors to cut away any tangles.why Roomba brush not spinning
  • Reinstall side brush: Once done clearing the tangles and dirt, replace the side brush and screw it back into place.

When you’re finished, press the “clean” button on your Roomba. The brush should now spin without any issues.

WARNING: Handle the bristles with care to avoid damage. Using a razor blade may be necessary if the brush is excessively hairy. Remember to replace the side brush and properly secure it in place after shaving.

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If the side brush appears to be broken or damaged, it should be replaced immediately. A malfunctioning side brush can lead to various problems, such as a failure to spin or difficulty cleaning effectively.

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Step 2: Clean the side brush module/gearbox

This is a small piece of hardware attached to a motor that power the brush. It contains metal or plastic gear shafts that become dusty over time and get jammed.

Open the gearbox module and clean the dirt inside it. You might find that some gear shafts are broken or misplaced, which you need to replace.

Here’s how to do this:

  1. Unscrew the screws: remove the screws on Roomba’s back cover that hold the gearbox cover in place.Clean roomba side brush module
  2. Clean the dirt: Look for hair or other♠ debris inside the gear case. If you find any, clear it.Clean roomba side brush gearbox
  3. Put the Gearbox in its place: Once done, screw it back in place.

Now, test if it’s spinning freely. If the brush still doesn’t rotate, you may need to replace the entire Gearbox. Before that, move on to the next step.

WARNING: Carefully remove the cover, being cautious not to lose any small parts inside

Step 3. Lubricate the Gearbox

Lubricate roomba side brush gearbox

After cleaning the gearbox, apply some dry lubricant like WD40 to make the gear shafts more efficient and working. This is because when the gear shafts get old, they can stick more and more due to rusting. Applying some lubricant will ensure that it can spin correctly.

When you finish lubricating the gearbox module, reassemble the Roomba correctly. Ensure that all components are securely in place. After some time, restart your Roomba and check if the side brush is now spinning correctly.

Tips: contact iRobot and describe the side brush’s behaviour. They will send you replacement parts if you have a warranty.

Step 4: Replace the side brush module/GearBox.

Replace Roomba side brush module

If none of the above troubleshooting steps fixes the problem, replace the Gearbox with a new one. Fortunately, replacing the gearbox/side brush module isn’t complicated. Follow the below steps:

  • First, remove the screw from the side brush module.
  • Pull the side brush module out of the Roomba.
  • Insert the new side brush module into the Roomba.
  • Replace the screw in the side brush module.

If it still doesn’t work, the motherboard may have a problem. In this case, contact iRobot customer service and describe your issue. They may help you fix the problem.

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Roomba Brush Module Replacement

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If you believe that the brush module is somehow damaged and will not function until it is replaced, consider purchasing a new replacement part from a retail shop.

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Q. How do I test my Roomba brush motor?

Testing the motor of your Roomba’s side brush is relatively easy. Follow the below steps:

  • Remove the brush motor from your Roomba.
  • Using a multimeter, test the continuity of the brush motor’s winding.
  • If the winding is open, the brush motor needs to be replaced.
  • If the winding is continuous, the brush motor is fine; you just need to clean the brushes.

You can also test the side brush motor by using a 9V battery. You need to wire the battery terminals to the + and terminals on the motor and see if it spins. If it works, then it’s likely the problem is the motherboard’s output. If not, make sure your connections to the motor and the battery are good.

Q. How long does a Roomba side brush last?

The side brush can last anywhere from six months to a year, depending on how often you use your vacuum. If you have a pet or live in a dusty area, you may need to replace the brush every 2-3 months.

Q. Will my Roomba work without a side brush?

The short answer is “NO.” Side brushes are responsible for sweeping debris into the path of the main brush, which then sucks it up into the vacuum chamber. For this reason, running the Roomba without brushes will do nothing.

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