Roomba Not Charging: How to Find the Cause and Fix It

A Roomba that will not charge is almost never a mystery for long. iRobot's support page for robots that do not turn on or charge points to three places to look, in this order: whether the dock has power, whether the charging contacts are clean and undamaged, and whether the battery needs to be woken, reseated or replaced. Most owners find the cause in the first two.

This guide follows that order. It starts with the checks that take a minute, moves to the contacts, explains the reset steps iRobot describes for specific series, and then decodes the charging error numbers using iRobot's own chart. Where the maker does not say something, we say so instead of guessing. Every fix below is attributed to the iRobot page it comes from, and the pages are listed at the end.

Check the Home Base and Power

Before you blame the robot, check the dock. iRobot's page lists this as the first real step: is there a light on the dock? If yes, power is reaching it and you can move on. If no, work through the power path.

On a dock that empties the bin (iRobot calls these AutoEmpty docks), iRobot says a red light shows when the dock is powered, and the robot should beep when it lines up with the contacts. Reseat the cord at both ends, and test the outlet with another device. If the cord is damaged, replace it. If the cord is fine and the dock still has no power, iRobot says the dock needs to be replaced.

Not every dock has a light. iRobot names the Roomba Essentials 1, the Roomba 200/2000 series and the Roomba 100/1000 series with the standard dock as models without dock lights. For those, the check is simpler: make sure the cord is fully seated at both ends.

Two Things That Look Like a Fault

First, the dock light is not meant to stay on. iRobot says it stays lit for about 4 seconds after the robot docks and then turns off while charging continues. The Roomba Combo 10 Max and Essentials 2 docks keep the light on for 60 seconds. Second, a red light on the robot means the battery is too low to start, which is a reason to leave it on the dock a while, not proof of a defect.

On the Roomba 200/2000 series, iRobot also notes a position tip: leave a gap of roughly 1 cm to half an inch between the dock and the bumper. Pushing the robot too far in can break the charging connection. If your robot docks in an unusual way, check the manual. iRobot says some models dock differently, such as the Combo j9+, which faces its camera toward the dock, and the Combo 10 Max, which always docks backward.

Clean the Charging Contacts

Dirty contacts are the most common cause of a robot that sits on the dock and never charges, and the fix costs nothing. iRobot's page and its charging error articles describe the same method.

Wake or Reset the Battery

If the dock is powered and the contacts are clean, the next suspect is the robot's own electronics or battery. iRobot describes a few resets, and which one applies depends on the series. We list only what the maker states.

New Robot or New Battery

iRobot's page says a replacement service robot does not include a battery, so the original battery has to be moved across. It also says a new lithium-ion battery must be woken on the dock before first use. The battery installation steps are in a separate iRobot article, so follow it for your model.

The Ship Mode Reset

For the Roomba 100/1000 series, the 200/2000 series and the Max 700 series, which iRobot lists for robots that shut down right after leaving the dock or do not gain battery percentage, the page describes this reset:

1. Take the robot off the dock and set it on a flat, level surface.
2. Hold the POWER button for at least 30 seconds, then release it.
3. Tap POWER again and confirm that no lights come on.
4. Put the robot back on the dock within 4 minutes.
5. Give it 30 seconds or more to start up. It should announce that it is charging.

iRobot says the Roomba Plus 400 and Plus 500 are covered by the ship mode step too. For other series, iRobot's page points to its separate ship or sleep mode article, then reactivating the robot on the dock, so follow that article or your manual for your exact model.

Reseat the Battery

This is the reset that appears across iRobot's pages. Remove the battery, put it back, and the robot reboots. In the page on charging error 19, iRobot goes further: if the error continues, remove the battery and leave it out of the robot for at least 30 minutes before reinstalling it. For error 20, the chart says to leave it out for 15 minutes.

Roomba Charging Error Codes

When a Roomba shows a charging error, the number tells you where to look. The table follows iRobot's own chart of charging errors for the Roomba 500 to 900 series, e, i, j, s and m series, and the 100/1000, 200/2000, Plus 400, Plus 500 and Max 700 series. A few numbers are missing because the chart does not cover them. Codes 101 to 121 in the Roomba Home app follow the same pattern with 100 added to each number.

Reading the Table

Two patterns stand out. Errors 4, 5, 19, 21 and 105 all point at the contacts, so cleaning them is the right first move for a long list of codes. Errors 2, 8, 9, 11 and 17 all point at the battery, and four of them tell you to confirm it is authentic. iRobot's article on charging error 8, which it says applies to all Roomba and Braava models, adds the reason: aftermarket batteries can cause unexplained charging errors.

iRobot's separate article on charging error 105 describes it as a low electrical current reaching the robot. The cause could be the robot, the battery, the dock or the power cord, so the steps cover all four: secure the plugs at the dock and the outlet, clean the contacts, check for damaged contacts and reseat the battery. On a dock that empties the bin, iRobot says to briefly remove the bag and confirm a red light appears on the dock.

If none of these steps clears the error, iRobot's answer is the same on every page: contact iRobot Customer Care. We cover when that makes sense in the last section.

When the Battery Is the Problem

A battery that fails or reports a hardware fault is behind errors 9 and 11, where iRobot's chart says the battery may need replacing after the authenticity check and a reseat. In the Roomba Home app, error 114 is described as an internal battery failure, and the chart's instruction is simply to replace the battery. A robot that charges but runs for a very short time is a related symptom, which iRobot covers in a separate article on short battery runtime.

The catch is where the replacement comes from. iRobot's pages repeatedly say to use an authentic iRobot lithium-ion battery. When we read Amazon's listings on November 6, 2026, the iRobot XLife battery for older Roombas was not available to buy, and iRobot's pages do not say where each model's battery is sold. The practical step is to ask iRobot Customer Care for the part number for your serial number before you order anything.

An Older Robot with a Third-Party Option

If your robot is from the 500, 600, 700 or 800 series era, there is a third-party battery on the market. It is not an iRobot product, and iRobot's guidance to use an authentic battery still applies to your warranty and to the error codes above. We include it because owners of these older robots often have no other route.

Check the model number on the underside of your robot against the list before you buy. If your model is not on it, do not assume it fits. If your robot is newer, the lithium-ion route runs through iRobot.

When to Contact iRobot or Replace the Robot

If you have worked through the dock, the contacts, the reset and the error table and the robot still will not charge, contact iRobot Customer Care. iRobot asks you to have three things ready: the robot, charged if possible and with you, its serial number, and proof of purchase from an authorized retailer if you are making a warranty claim. For damaged contacts, iRobot's pages say the robot or the dock may need to be replaced, so the answer may be a repair or swap, not a cleaning job.

If you are weighing the company's current position before you spend money on parts or a repair, our iRobot bankruptcy page covers what the news means for owners. Our iRobot Roomba reviews compare the current models.

When a New Robot Is the Better Spend

An older robot with a failed battery, damaged contacts and an error that comes back is a fair moment to look at a new one. The cost of a battery, a dock and your time adds up, and a robot from the 500 or 600 era lacks features that current models have. We do not print prices, because they change, but the budget tier is where a replacement for a basic Roomba usually sits.

If the Roomba is not the brand you want to stay with, our best robot vacuums guide sorts current models by home and budget. If you own a Shark and it is the one that will not charge, see our Shark robot vacuum not charging guide instead.

Roomba Not Charging FAQ