Roomba Charging Error 5 means charging current is not reaching the robot correctly. It does not automatically mean the battery is dead. First check the dock’s power, clean the charging contacts, inspect them for damage, and reseat the battery. Only consider buying a replacement battery after those checks.
What Roomba Charging Error 5 means
On current iRobot guidance, Charging Errors 4 and 5 indicate that electrical current is not reaching the robot. The cause may be the wall outlet, power cord or adapter, Home Base or Clean Base, charging contacts, battery installation, battery, or the robot’s internal charging circuitry. See iRobot’s Charging Error 4 and 5 guidance.
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Depending on the model, you may hear “Charging Error 5,” see “Err5,” observe five flashes, or receive the message in the iRobot app. The exact indicator varies across Roomba generations, but the practical troubleshooting path is similar.
Step-by-step troubleshooting
1. Check the outlet, cord, and charging base
- Remove the Roomba from the dock.
- Unplug the charging base from the wall.
- If the cord is detachable, unplug and reconnect it at the base.
- Plug the base directly into a known-working wall outlet, not an extension lead or power strip.
- Place the robot back on the dock and check for its normal charging indication.
For a Clean Base, lift the lid and check the indicator described in iRobot’s instructions. A light confirms that at least part of the base is receiving power; it does not prove that the contacts, battery, or charging circuit are working correctly.
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2. Clean the charging contacts
There are two contact areas to clean:
- The metal contacts on the underside of the Roomba.
- The raised or spring-loaded contacts on the Home Base or Clean Base.
- Unplug the dock.
- Turn the robot over on a stable, dry surface.
- Wipe the metal contacts with a soft, lightly dampened cloth or melamine foam.
- Remove dust, hair, residue, and oxidation until the metal is visibly clean.
- Clean the matching contacts on the dock.
- Allow everything to dry fully.
- Reconnect the base and place the robot on it.
Do not spray liquid into the dock, pour water onto the robot, use metal tools, or scrub with abrasive sandpaper. Do not charge the battery outside the Roomba with improvised equipment.
3. Inspect for damaged contacts
Cleaning will not solve a contact that is physically damaged. Look for:
- Green or copper-colored discoloration
- Black scorching, pitting, or burn marks
- Melted or warped plastic
- A dock contact stuck in the down position
- A spring contact that does not move and return normally
- Loose, bent, or weakly contacting hardware
iRobot identifies green or copper-colored contacts and contacts stuck down as signs of damage. Do not permanently repair melted plastic or force severely bent contacts back into shape. Stop using the equipment if you see burning, overheating, or liquid damage.
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4. Remove and reinstall the battery
Battery access differs between Roomba families, so identify the exact model and follow its model-specific instructions. In general:
- Remove the robot from the dock and turn it over.
- Remove the bottom cover or battery cover.
- Lift out or disconnect the battery.
- Check for a loose connector, corrosion, swelling, leakage, damaged wiring, or melted insulation.
- Reinstall the battery firmly and refit the cover.
- Place the robot on the dock and test again.
Reseating the battery can restore a poor connection and acts as the safest general reset-like step supported by current iRobot guidance.
5. Check the battery’s condition and compatibility
Do not use a battery that is swollen, hot, leaking, cracked, unusually smelly, or physically damaged. Never puncture, open, short, or independently recharge a Roomba battery. Follow local battery-recycling or hazardous-waste guidance for a damaged pack.
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A replacement battery becomes more plausible when the original is several years old, runtime had already declined, the robot was stored fully discharged for a long period, or Error 5 continues after cleaning and reseating. Prefer an authentic iRobot Lithium-Ion battery compatible with the exact model. iRobot warns that unknown charging errors can occur with aftermarket batteries; see its official parts and accessories page.
A new battery will not repair a dead adapter, defective dock, damaged contacts, or failed charging circuitry inside the robot.
Battery or dock: which is more likely?
The symptoms below are clues, not definitive tests. Roomba designs and dock compatibility vary by generation.
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| Symptom | More likely causes | Next step |
|---|---|---|
| The dock has no normal power indication | Outlet, cord, adapter, or base | Test the outlet and reconnect every cable. |
| The robot charges after cleaning | Dirty or oxidized contacts | No replacement is needed if charging remains reliable. |
| Contacts are green, burned, melted, or stuck | Damaged robot or dock contacts | Service or replace the affected component. |
| The robot charges briefly, then shows Error 5 | Battery, poor contact, electrical fault, or charging circuit | Reseat the battery and inspect for heat or damage. |
| Error began after a third-party battery was installed | Battery compatibility or battery fault | Reinstall the original battery or use an authentic compatible one. |
| The robot works on one compatible base but not another | Base, adapter, or base contacts | Service or replace the failing base or adapter. |
| The robot fails on multiple known-good charging setups | Robot, battery, or internal charging circuit | Contact iRobot or a qualified repair service. |
| The error followed liquid exposure | Corrosion or electrical damage | Disconnect power and seek service; do not continue charging. |
Model-specific reset notes
There is no single button combination that resets every Roomba. Older 500-series documentation describes holding SPOT and DOCK/DEMO for 10 seconds, but that procedure should not be assumed to apply to 600, 700, 800, 900, i, s, or j series models. See the Roomba 500 Series service documentation for that model family.
Newer robots may use different controls or app-based recovery. Verify the model before following any button-reset procedure. Removing and reinstalling the battery is the safer general step when the model-specific instructions are unavailable.
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Other numeric errors can require different repairs:
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- Error 102: the battery is not charging because a fault was detected.
- Error 115: a battery-cell failure was detected during charging.
- Error 121: the robot is on the dock but losing charge instead of staying charged.
Use the relevant iRobot Error 102, Error 115, or Error 121 guidance rather than applying the Error 5 diagnosis to every code.
When to contact iRobot
Contact iRobot Customer Care if Error 5 remains after confirming dock power, cleaning the contacts, reseating a compatible battery, and checking for visible damage. Support is especially appropriate when:
- The robot or dock is under warranty.
- Contacts are melted, burned, or badly corroded.
- The robot has liquid damage.
- A genuine compatible battery still produces the error.
- You are uncomfortable opening the battery compartment.
- The battery becomes hot or shows physical damage.
Have the Roomba, serial number, battery type, dock type, symptoms, and—if making a warranty claim—proof of purchase from an authorized retailer ready.
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