How to Fix Epson EcoTank Error E02 (100016) Scanner Error After Firmware Downgrade

Question:

I have an Epson WF-3820 printer that's showing an Error E02: 100016 - Scanner Error. This error appeared after I downgraded the firmware so I could use remanufactured ink cartridges again. Since Epson's latest firmware updates prevent third-party inks, I rolled it back successfully and can print now, but this new scanner error popped up. Is there a way to fix it?

Answer:

Now, regarding your issue - the Epson Error E02 (100016) "Scanner Error" is a common problem that's unrelated to firmware changes. Even though the timing might make it seem connected to your downgrade, this particular error is mechanical in nature and points to a malfunction in the scanner assembly or scanner motor system rather than the software.

1. What the Error E02 (100016) Means

When your Epson WF-3820 displays this message:

"Error code E02: 100016 - Scanner error. See your documentation for details,"

it means the printer's internal sensors have detected that the scanner unit cannot initialize properly. This can happen due to:

• A stuck scanner carriage, which prevents the scanner bar from moving freely.

• Dirty or misaligned scanner sensors that fail to detect the home position.

• A disconnected or damaged scanner cable.

• An internal logic board glitch following a power or firmware reset.

2. Confirm It's Not Firmware-Related

As mentioned in your question, you downgraded the firmware to allow remanufactured ink cartridges to work again. This was a smart workaround since Epson's newer firmware updates indeed block non-genuine ink chips. However, the E02: 100016 error isn't triggered by the firmware change. Firmware primarily affects printhead operations, ink recognition, and network communication - not the scanner motor or sensors.

So, even though the error appeared right after your firmware downgrade, the root cause is mechanical, not software-related.

You can verify this by disconnecting the scanner cable and turning the printer on - the same error will appear regardless of firmware version.

3. How to Fix the E02 (100016) Error

Here are several steps to resolve the issue:

Step 1 - Power Reset the Printer

1. Turn off the printer and unplug the power cable.

2. Wait for at least 3-5 minutes.

3. While the printer is unplugged, open the scanner lid and gently move the scanner bar (the lighted rod) left and right to ensure it isn't jammed.

4. Plug the power back in and turn the printer on.
   If the scanner reinitializes successfully, the error should clear.

Step 2 - Clean and Check the Scanner Track

• Dust, grease, or leftover packing tape can block the scanner carriage.

• Use a soft, lint-free cloth to wipe the scanner glass and track.

• Make sure the scanner lock switch (if your model has one) is set to "unlocked."

Step 3 - Check the Scanner Cable Connection
If you feel comfortable opening the printer (only attempt this if you have some technical experience), remove the top cover and verify that the flat ribbon cable running from the scanner to the mainboard is securely connected. A loose or oxidized connection can trigger the E02 code.

Step 4 - Perform a Scanner Self-Test
Some Epson models allow a self-test through the hidden maintenance menu. Access it by turning on the printer while holding down the Stop and Right Arrow buttons simultaneously (model-dependent). This test will attempt to move the scanner bar; if it fails, the motor or sensor likely needs replacement.

For a visual explanation, please check out our YouTube video on Epson scanner troubleshooting: Fix Epson EcoTank Error E02 Scanner Error (https://www.youtube.com/watch?v=BTKtdRAHLxA). It walks through the process of diagnosing mechanical failures and understanding when a part replacement is necessary.

4. When to Seek Professional Help

If the error persists even after cleaning and resetting, the scanner assembly or mainboard might be defective. Unfortunately, replacement of these parts requires calibration and firmware pairing, which isn't possible through home repair.

Addressing printer issues can be a complicated affair due to the hands-on nature of the problems. Therefore, we're unable to provide remote troubleshooting or repair assistance. However, we offer in-person diagnostics and repair services through our local facility - you can learn more at our Printer Repair Service page (https://bchtechnologies.com/printer-repair-service). Please note that our services operate on a first-come, first-served basis, and due to high demand, there may be a waiting period of a few weeks.

If you prefer a do-it-yourself approach, we highly recommend visiting our YouTube channel (https://youtube.com/@bchtechnologies). Use the search icon next to the "About" tab to look for specific topics, such as Epson error codes, scanner motor repair, or firmware troubleshooting. We've been publishing repair videos for nearly a decade, and YouTube's built-in search will help you quickly locate the most relevant tutorials.

Thank you again for your patience and for being part of our growing BCH Technologies community. Your continued engagement and feedback are what inspire us to keep creating more detailed and helpful printer repair guides.