ConsFirst / Troubleshooting

Roomba not charging? What to check, in order

Dock power, dirty contacts, a reset, error codes and the battery: the checks iRobot's support pages give, easiest first.

Steps from iRobot's official support pages and manuals · Sources checked October 30, 2026 · Compiled by the ConsFirst editor

Symptoms and what they usually mean

Red light when you try to start a clean

iRobot says a red light is normal and means the battery is too low to start. Put the robot on the dock and see whether it starts charging. On the Roomba 100/1000 Vac series (which includes the Roomba 105 Vac), a flashing red power-button light means low battery or an error.

The robot says "Charging error" with a number

The number tells you where to look: the contacts, the battery, or the temperature. See the error table in step 5.

No lights at all, even on the dock

Check the dock's power first, then try the sleep-mode reset in step 4. iRobot also notes that a new iRobot battery has to be woken up on the dock before its first use.

It ends a clean somewhere else and doesn't make it home

That's usually a docking problem, not a charging one: dock placement, interference from other docks, or something covering the bumper or dock. See step 8.

Likely causes

• No power at the dock: a loose plug at the wall or at the dock, a dead outlet, or a damaged cord.
• Dirty or damaged charging contacts on the robot or the dock. iRobot calls debris a common cause of low-current errors.
• The robot needs a reset, or a new battery hasn't been woken up on the dock yet.
• Temperature: iRobot's chart has errors for a battery that is too warm or too cold to charge.
• A battery fault, or a non-iRobot battery. iRobot says aftermarket batteries can trigger charging errors.

Step-by-step fixes, easiest first

1. Make sure the dock has power

   Unplug the power cord from the wall and from the dock, then plug both ends back in firmly. Test the outlet with something else you know works.

   On an AutoEmpty (self-emptying) dock, lift the lid and briefly take out the bag: the dock's light should turn red if it has power. Some docks, including the standard dock that comes with the Roomba 100/1000 series, have no light, so just check the cord connection. If the outlet works but the dock still gets no power, iRobot says the cord or the dock needs replacing.

   Source: iRobot: Why does my Roomba or Braava not turn on or charge properly? (article 19952); iRobot: Charging Error 105, all Roomba models (article 10605). Checked October 30, 2026.

2. Clean the charging contacts on the robot and the dock

   Unplug the dock first. Then gently wipe the metal charging contacts on the bottom of the robot and on the dock with a lightly dampened melamine foam pad (such as a Magic Eraser) or a cloth.

   Look at the contacts while you're there. iRobot says contacts that are green or copper-colored, or stuck down, are damaged, and that part (robot or dock) needs replacing. While the robot is upside down, also clear hair and debris from the brushes and the front caster wheel.

   Source: iRobot: Why does my Roomba or Braava not turn on or charge properly? (article 19952); iRobot: Charging Error 105, all Roomba models (article 10605). Checked October 30, 2026.

3. Check how the robot sits on the dock

   Make sure the robot is docking in the right direction and sitting squarely on the contacts. When it's aligned, the robot should beep and the dock's light (if it has one) should come on and then turn off: after about 4 seconds on most docks, or about 60 seconds on the Combo 10 Max and Essentials 2 docks. iRobot says that's normal and saves energy. On models with a light ring, iRobot says the ring lights up to show the robot is charging. On the Roomba 100/1000 Vac series, see the light guide below.

   Source: iRobot: Why does my Roomba or Braava not turn on or charge properly? (article 19952); iRobot: Does Not Return Home, all Roomba models (article 32678). Checked October 30, 2026.

4. Reset the robot (sleep mode), then dock it

   iRobot's current instructions for robots that won't power on or charge:

   • Take the robot off the dock and put it on a flat, level floor.
   • Press and hold the POWER button for at least 30 seconds, then let go.
   • Tap POWER once. If no lights come on, the robot is in sleep (ship) mode.
   • Put it back on the dock within 4 minutes. It can take more than 30 seconds to start up, and then it should announce that it's charging.
   • Still no lights? Remove the battery, reinstall it, and dock the robot again.

   iRobot's article also has notes for specific series, so check it if your robot's buttons look different.

   Source: iRobot: Why does my Roomba or Braava not turn on or charge properly? (article 19952). Checked October 30, 2026.

5. Look up the charging error number

   iRobot says charging only works when the battery, the robot and the dock are all working, and the robot stops charging for safety when it detects a fault in any of them. The error number says which part to look at. A summary of iRobot's chart:

   4, 5, 104, 105, 21, 121Little or no current reaching the robot, or it docked but couldn't charge. Clean the charging contacts (step 2). For error 105, iRobot also says to check the cord and remove and reinstall the battery.

   1, 101The robot doesn't detect a battery. Remove and reinstall the battery.

   6, 7, 106, 107The battery is too warm or too cold. Let the robot come to room temperature and try again (step 6).

   2, 102Charge fault (too much current). Confirm the battery is a genuine iRobot lithium-ion battery, and check for liquid damage.

   3, 103Charge fault in the charging system. Try charging again, and check for liquid damage.

   8, 17, 117The robot can't communicate with the battery, or the battery may not be genuine. Confirm it's an iRobot battery, then remove and reinstall it.

   9, 11, 109, 111, 114Battery failure or hardware fault. The battery may need replacing (114: replace it).

   19, 119Charging timed out. Remove and reinstall the battery, and clean the contacts.

   20, 120Battery fault or not ready to charge. Take the battery out for 15 minutes, put it back, and replace it if the error comes back.

   For errors 110 and 115, the chart sends you to the app for help.

   Source: iRobot: Charging Error Chart, all Roomba and Braava models (article 19598); iRobot: Charging Error 105, all Roomba models (article 10605). Checked October 30, 2026.

6. Let the robot warm up or cool down

   If the robot has been in a hot spot, a cold garage or a car, bring it to room temperature before you try again. iRobot's chart lists separate errors for a battery that is too warm or too cold to charge.

   Source: iRobot: Charging Error Chart, all Roomba and Braava models (article 19598). Checked October 30, 2026.

7. Reseat the battery and check that it's genuine

   Removing and reinstalling the battery effectively reboots the robot and clears several charging errors, according to iRobot. Use only a genuine iRobot lithium-ion battery: iRobot says aftermarket batteries can cause charging errors and void the warranty, and warns about counterfeit batteries from unauthorized sellers.

   Source: iRobot: Charging Error 105, all Roomba models (article 10605); iRobot: Charging Error Chart, all Roomba and Braava models (article 19598). Checked October 30, 2026.

8. If it won't get back to the dock, check where the dock is

   If the robot charges fine when you set it on the dock by hand but doesn't get back on its own, iRobot suggests:

   • Put the dock on a hard, level surface against a wall, with a clear path in front and at least 4 feet (1.2 m) from stairs.
   • Keep other docks more than 8 feet (2.5 m) away to avoid infrared interference.
   • Remove any stickers, tape or paint from the robot's bumper and the dock.
   • If you picked the robot up during a clean, set it down within 6 feet (1.8 m) in front of the dock, facing it, and send it home from the robot's HOME button or the app.

   Source: iRobot: Does Not Return Home, all Roomba models (article 32678). Checked October 30, 2026.

Roomba 105 Vac: what the lights mean

The iRobot Roomba 105 Vac Robot Vacuum belongs to iRobot's Roomba 100/1000 Vac series. iRobot's guide to that series says the power-button light means:

• White: fully charged and on the dock.
• Flashing white: the robot should go back to the dock to charge.
• Pulsing white: charging on a low battery, or installing a software update. If you try to start a clean now, the buttons flash red and the robot says it can't start because the battery is low.
• Flashing red: low battery or an error.

On this series, hold POWER for 3 seconds to turn the robot on and 10 seconds to turn it off. iRobot also notes that a small spark when the robot touches the metal charging contacts is normal and not dangerous. For long-term storage, take the robot off the dock, hold POWER for 10 seconds, and keep it somewhere cool and dry.

Source: iRobot: Roomba 100/1000 Vac / Combo + AutoEmpty Dock anatomy and user interface (article 10501). Checked October 30, 2026.

What owners report

From our page on the iRobot Roomba 105 Vac Robot Vacuum, which summarizes owner reviews and expert tests. Charging and docking trouble is one of the three main complaints we found for this model:

These are reports, not failure rates. We don't know how often the fixes above solved these owners' problems.

When to contact iRobot, and the warranty

• Contact iRobot Customer Care if the robot still won't power on or charge after these steps, if the contacts look damaged, or if the error points to a battery or charging fault that keeps coming back. iRobot asks you to have the robot with you (charged, if possible), its serial number, and, for a warranty claim, your proof of purchase.
• Warranty: iRobot's limited warranty for robot vacuums runs one year from the date of purchase (or delivery) and includes the robot battery. It doesn't cover normal wear and tear, including battery wear, or damage from replacement parts and consumables that iRobot didn't provide or recommend. Terms depend on the country of purchase.
• Is iRobot still around? iRobot went through a pre-packaged Chapter 11 process. Its January 23, 2026 press release says Picea, previously its primary contract manufacturer, acquired the company, and its CEO says the company is focused on supporting its customers. Its support site was online when we checked on October 30, 2026.

Source: iRobot: Why does my Roomba or Braava not turn on or charge properly? (article 19952); iRobot Limited Warranty (article 3096); iRobot press release, January 23, 2026. Checked October 30, 2026.

Sources

All official iRobot pages, checked October 30, 2026.

• iRobot: Why does my Roomba or Braava not turn on or charge properly? (article 19952)
• iRobot: Charging Error Chart, all Roomba and Braava models (article 19598)
• iRobot: Charging Error 105, all Roomba models (article 10605)
• iRobot: Does Not Return Home, all Roomba models (article 32678)
• iRobot: Roomba 100/1000 Vac / Combo + AutoEmpty Dock anatomy and user interface (article 10501)
• iRobot Limited Warranty (article 3096)
• iRobot press release, January 23, 2026

More: all troubleshooting guides · robot vacuums compared by owner complaints · how we research