Canon MG3620 printer error B200 fix on Windows 10

You're printing a document on your Canon MG3620, and suddenly the printer stops. The orange and green lights start blinking in a pattern, and the screen flashes Error B200. This usually happens after a paper jam that you cleared, or after the printer sat unused for a few months. The printer refuses to print anything—no test page, no alignment, nothing. You've restarted it, unplugged it, and reinstalled the drivers. The error stays.

What causes error B200 on the Canon MG3620?

Error B200 is Canon's code for a hardware fault inside the printer. It's not a software glitch. On the MG3620, the most common trigger is a locked printhead carriage. The carriage moves back and forth during printing, but if it can't move freely—because of dried ink on the rails, a stuck purge pad, or a mechanical jam—the printer's firmware detects the load on the motor and shuts down with B200.

The second common cause is a dead purge unit. The purge unit sits at the far left of the printer's path. It's a little pump that sucks ink from the printhead during cleaning cycles. If the purge unit seizes up, the printer can't complete its startup self-test, and B200 appears.

Third, a blown printhead can trigger B200. If you tried to print with an empty ink cartridge or used a refilled cartridge that leaked, the electrical contacts on the printhead can short out. The printer sees that as a hardware failure.

Step-by-step fix for Canon MG3620 error B200

The fix depends on what's actually stuck. I'll walk you through the three checks in order. You don't need to be a technician, but you need a steady hand and patience.

Step 1: Power down and unplug everything

1. Turn off the printer using the power button.
2. Unplug the power cord from the back of the printer. Wait 30 seconds.
3. Unplug the USB cable from the printer and computer. We're going to work on the printer alone.

Step 2: Open the printer and check the printhead carriage

1. Open the scanner lid. Lift it all the way up until it clicks.
2. Reach inside and gently push the printhead carriage (the black plastic box that holds the ink cartridges) to the right. It should slide smoothly. If it doesn't move at all or makes a grinding sound, you've found the problem.
3. Look at the metal rail the carriage slides on. If you see dried ink or gummy residue, that's what's stopping it. Take a cotton swab dipped in distilled water (not tap water, it leaves minerals) and clean the rail. Don't use alcohol—it can damage the rail's lubrication. Wipe the rail clean. Let it dry for 2 minutes.
4. Slide the carriage back and forth by hand. You should feel some resistance but no sticking. If it still feels stuck, move to step 3.

Step 3: Check the purge unit (the left side)

1. With the carriage moved to the right, look at the left side of the printer's interior. You'll see a plastic tab with a rubber pad underneath. That's the purge unit.
2. Press the tab down gently. The pad should move up and down a little. If it's rock solid and won't budge, the purge pump is seized.
3. To free it, you can try to manually rotate the gear behind it. You'll see a white gear with teeth. Use a small flathead screwdriver to rotate it clockwise a quarter turn. You should hear a click. Then try pressing the tab again. If it moves, great. If not, the purge unit is dead and will need replacement. For most people, that means a new printer—replacing that part costs almost as much as the printer.

Step 4: Remove and inspect the printhead (only if steps 2-3 didn't fix it)

1. If the carriage moves freely and the purge unit is fine, the printhead itself might be bad. Remove the ink cartridges first. Push down on each cartridge and pull it out.
2. The printhead is the metal part with gold contacts sitting in the carriage. Lift the green plastic lever next to it, then lift the printhead straight up.
3. Look at the gold contacts. If you see black or burnt spots, the printhead is fried. Also look at the nozzles on the bottom. If there's dried ink crust, you can try cleaning it with a damp paper towel, but if the contacts are burned, replacement is the only option.
4. You can buy a new printhead for about $15-20 online. Search for "Canon MG3620 printhead"—it's part number QY6-0082. Install it by reversing the removal steps.

What to check if it still fails after these steps

If you've cleaned the rails, freed the purge unit, and replaced the printhead, and the B200 error still shows, the main logic board on the printer is damaged. That's a $40 part and requires soldering to replace. At that point, you're better off buying a new Canon MG3620 (about $60 at most retailers) or upgrading to a model like the Canon PIXMA TR4720, which doesn't have this purge unit failure pattern.

One last thing: if you were using third-party ink refills or recycled cartridges, that likely caused the B200 error. Those cartridges can leak ink onto the printhead contacts. Stick with Canon-brand cartridges on this model. They're more expensive, but you'll avoid this headache.

Final tip: After you fix the error, run a printhead cleaning cycle from the printer's menu. Go to Settings > Maintenance > Cleaning. If the printer completes that without error, you're good to go. If B200 returns mid-cleaning, your purge unit is definitely the culprit.