Your Canon MAXIFY GX5020 flashes a paper jam error but you've already looked inside, maybe found a torn scrap, and the message won't go away. This is a common headache with the GX5020 because the paper path has several tight zones, the duplex unit for auto two-sided printing at the back, the pickup rollers under the print head carriage, and the front input tray feeding path, and even a tiny shred in any of them triggers the same stubborn error.
The fastest fix is to open the rear access door at the back of the printer. Most jams that don't clear from the front end up hiding in the duplex unit. Pull out any paper you find, close the door until it clicks flush, then power-cycle the printer by holding the power button until it shuts off and pressing it again.
If the error persists, work through the rest of the fixes below.
Why the GX5020 Keeps Reporting a Paper Jam
The GX5020 has a 250-sheet front input tray and a built-in duplex unit that flips paper for two-sided printing. Each section has its own sensors and rollers, and paper can get stuck in any of them. Common causes of phantom or persistent jam errors on this model include:
- Paper scrap in the duplex unit: the most common cause of a jam error that won't clear after you've already pulled visible paper.
- Dirty or glazed pickup rollers: after heavy use the rubber loses grip and feeds multiple sheets at once or pulls paper crooked.
- Paper guides not snug against the stack: loose side guides let sheets skew and jam halfway through a print job.
- Incompatible paper weight: the GX5020 is designed for 20 lb plain paper; thin or thick stock jams more often.
- Rear access door not fully closed: if the door isn't seated flush, the printer thinks the paper path is open and shows a jam error.
- Paper sensor flag bent: a small plastic flag inside the path got bent during a previous jam clearance.
Power Off Before Reaching Inside
Before you open any panel or pull at visible paper, turn the printer off and unplug the power cord. Reaching into a powered-on GX5020 can trigger the feed rollers to engage while your fingers are in the path, and pulling paper while the printer is active can damage the paper sensors. Hold the power button until the screen goes dark, then unplug the cord. Now you can safely work inside.
Open the Rear Duplex Unit and the Paper Output Tray
The duplex unit at the back of the GX5020 is the primary hiding spot for paper scraps that cause phantom jam errors. Walk to the back of the printer, press the release tab on the rear access cover, and pull it open. Shine a flashlight inside and look for any paper stuck in the rollers or along the path. Pull paper in the direction it was originally feeding, pulling backward against the feed direction can tear sheets and bend sensor flags.
Also open the paper output tray at the top. Pop open the extension tray and look at the rollers beneath it. Small torn scraps sometimes lodge there after a partial jam. Close both covers firmly until they click into place, plug the printer back in, and power it on to see if the error clears.
Reseat the Paper and Adjust the Side Guides
Pull the input tray completely out of the printer. Remove the entire stack of paper and tap the edges on a flat surface to realign the sheets. Fan the stack slightly to separate any sticking pages. Place the stack back in the tray. Slide the side paper guides inward until they touch the edges of the paper snugly, they shouldn't bend the sheets, but there should be no wobble. Slide the rear guide forward until it rests against the back of the stack.
Loose guides are a frequent cause of skew-driven jams on the GX5020, especially during longer print runs. Snug guides keep every sheet feeding straight.
Clean the Pickup Rollers
If the printer keeps grabbing multiple pages or feeding paper at an angle, the pickup rollers are likely dirty. Open the front cover (the one you lift to access the ink tanks). The carriage will move to the center. Look down at the bottom of the paper path and you'll see two black rubber rollers. Dampen a lint-free cloth with distilled water, no tap water, no cleaning chemicals, and wipe each roller, rotating it with your finger as you go to clean the entire surface.
Let the rollers air-dry for about 5 minutes before closing the cover. Clean rollers grip paper properly and eliminate multi-sheet feeds and skew issues.
Use Standard 20 lb Paper for Best Results
The GX5020 is a high-volume office printer rated for up to 6,000 mono pages per ink bottle set, and it performs best with standard 20 lb plain paper. Thinner paper (under 17 lb) tends to buckle in the duplex unit. Heavier paper (over 28 lb) can jam in the narrow roller path near the print head. If you've been using cheap copy paper or specialty cardstock, switch back to 20 lb for a few test pages to see whether the jams stop.
Run a Nozzle Check and Clean the Print Head
This doesn't sound like a jam fix, but a clogged print head on the GX5020 can cause paper to pause mid-print and trigger a jam error. The printer's pigment-based GI-26 ink is more prone to clogs if the printer sits unused for a week or more. Open the Canon PRINT app on your phone (available for iOS 14+ and Android 8+). Tap your GX5020, then tap Maintenance > Nozzle Check. If the pattern shows gaps, run Cleaning from the same menu.
On the printer's own control panel you can also press Setup > Maintenance > Nozzle Check. A full cleaning cycle takes about 3 minutes and uses a small amount of ink, but it can clear a stubborn jam error caused by a paper pause.
Check the Paper Sensor Flag Inside the Path
Near the front of the paper path, inside the printer, there's a small plastic flag that detects when paper is present. If you pulled a jam out roughly in the past, this flag may have bent. When it's bent, the sensor always reports paper in the path and the printer refuses to feed. Open the front cover, look down into the paper path with a flashlight, and locate the small plastic flag near the center.
Tap the flag gently with a fingernail, it should spring back freely. If it stays flat or feels brittle, don't try to bend it back into shape; the plastic will snap. You'll need to order a replacement sensor flag for the GX5020 from Canon's parts supplier.
Reset the Printer Settings to Factory Defaults
If you've cleared every possible paper path zone and the jam error still shows, a corrupted setting can sometimes keep the sensor flag reading wrong. On the GX5020's control panel, press Setup > Reset settings. Confirm the reset. The printer will reboot and restore its factory defaults, clearing any stuck sensor state or misconfiguration. You'll need to reconnect to Wi-Fi afterward, so have your network password handy. This reset has solved many phantom jam errors on the 2023 GX5020 that didn't respond to physical clearance.
