Canon Error 5B02 — What It Means & How to Fix It
Updated August 2026 · Independent PrinterCare USA support guide
The Canon 5B02 error is one of the most common waste tank alerts you'll encounter, and it stops your printer completely until resolved. This error appears because Canon printers track how much ink has been diverted to the waste absorber during cleaning cycles, and once that counter reaches its limit, the machine locks to prevent overflow and potential damage to internal components.
The good news is that this error does not necessarily mean your waste absorber is physically full of ink—it means the software counter has hit its limit. You have three realistic options: use Canon's official adjustment utility to reset the counter yourself, pay a service center around $49 to $75 for a remote or in-person reset, or replace the waste absorber assembly if it genuinely needs it.
How to fix it — step by step
- Identify your exact Canon model number. Locate the model number on the front panel of your printer or check your original documentation. This is critical because each Canon model line uses different service utilities. Write down the complete model number such as MG3620 or TR8520, as you will need it to download the correct tool.
- Power cycle the printer completely. Turn off your Canon printer using the power button and unplug the power cable from the wall outlet. Wait at least 60 seconds, then plug it back in and power it on again. Sometimes this temporary reset clears the error, though the counter will still be at maximum and the error will return after a few print jobs.
- Download the Canon adjustment utility for your model. Visit the official Canon support website and navigate to your printer model's driver and downloads section. Look for the Canon adjustment program, service utility, or reset tool—the exact name varies by model. Download the correct utility for your operating system, whether Windows 11 or macOS, and save it to your desktop.
- Install and run the adjustment utility on your computer. Extract or run the downloaded utility file on your Windows 11 or Mac computer, not on the printer itself. Follow the on-screen prompts to select your printer from the list of detected devices. The utility will connect to your printer over USB or network connection and display available adjustment options.
- Locate and reset the waste ink counter. Within the adjustment utility, find the option labeled waste ink absorber reset, waste counter, or service reset—exact wording depends on your model. Select this option and confirm that you want to reset the counter to zero. The utility will communicate with your printer and update the counter value.
- Verify the reset was successful. After the utility completes, power off your printer and wait 30 seconds. Turn it back on and try printing a test page or opening the printer menu to confirm the 5B02 error no longer appears. If the error persists, disconnect the USB cable and try using a network connection instead, as some resets require the connection method to match.
- Contact a service center if the DIY reset fails. If you cannot access the adjustment utility or the reset does not clear the error, contact an authorized Canon service center or call Canon customer service at their support line. They can perform a remote reset for around $49 to $75, or arrange service if your waste absorber needs genuine replacement.
- Consider replacing the waste absorber if it is physically full. If your printer has been in heavy use for years and you suspect the waste absorber is actually full of ink rather than just counter-triggered, you may need a replacement absorber assembly. This is a parts-and-labor service typically costing $75 to $150 depending on your model and whether you handle the replacement yourself or have a technician do it.
Still stuck? We'll fix it for you — remotely, today.
A real technician connects to your computer securely, fixes the problem while you watch, and you pay only after your printer is working again.
Frequently asked questions
Is my waste ink absorber actually full of ink, or is this just a software counter?
Most Canon printers show this error when the software counter reaches its limit, not necessarily when the physical absorber is overflowing with ink. However, if your printer has been in heavy daily use for several years, the absorber may genuinely need replacement. A service technician can open the printer and visually inspect the absorber to determine which situation applies to your machine.
Can I ignore the 5B02 error and keep printing anyway?
No, Canon locks the printer completely when this error appears—you will not be able to print, scan, or use other functions until the error is resolved. The safety lockout is intentional to prevent ink overflow and damage to internal components, so the only way forward is performing the reset or contacting a service center.
Do I need to use a USB cable to run the Canon adjustment utility, or can I do it over WiFi?
Most Canon adjustment utilities work over both USB and network connections, but some older models and specific utilities function better with a direct USB connection. If your first attempt fails using WiFi, disconnect the printer from the network, connect it via USB cable to your computer, and try running the utility again.
After I reset the waste counter, how long until the 5B02 error appears again?
The reset sets your counter back to zero, so the timing of the next error depends entirely on your printer usage. Light home users might not see the error again for one to two years, while businesses running high-volume print jobs could trigger it again within months. If the error returns very quickly, it suggests your waste absorber genuinely needs physical replacement rather than just a counter reset.