Epson ST-2000 Error 100016: What It Means and How to Address It

Question:

My Epson ST-2000 printer is showing error code 100016. What does this mean, and how can I fix it?

Answer:

Understanding Epson Error 100016 on the ST-2000

The Epson ST-2000 (also known as EcoTank ST-2000 or ET-2720/ET-2750 family variants) sometimes triggers Error 100016, which is typically associated with a scanner hardware malfunction.

On Epson units that include a flatbed scanner, this error commonly points to a failure in the scanner's communication pathway. The most frequent cause is:

1. A Loose or Disconnected FFC Cable (Flat Flexible Cable)

The scanner assembly uses one or two FFC ribbons to communicate with the main board. These cables can:

• Get partially unseated

• Shift during transport

• Be tugged loose if the top lid was opened too far during maintenance

When the mainboard cannot detect the scanner's home position or movement due to this disconnect, it reports Error 100016.

How to Approach the Repair

Step 1: Power Reset (Quick Check)

Before opening anything, perform a basic reset:

1. Turn off the printer

2. Unplug it for 5 minutes

3. Plug it back in and restart

This rarely fixes a physical issue but rules out temporary logic faults.

Step 2: Inspect the Scanner Cable (Most Likely Fix)

If you're comfortable opening the case:

1. Open the top scanner section.
   The hinges allow it to lift partially, but accessing the cable requires opening the upper shell of the printer.

2. Locate the FFC cable.
   This is usually a white ribbon cable running from the scanner unit to the mainboard.

3. Check for disconnection.
   In most cases, the cable is visibly unseated or crooked in its socket.

4. Re-insert the cable.
   Make sure:

   • The cable is fully straight

   • The silver contact pads are clean

   • The locking tabs on the connector are secure

5. Reassemble and test.

If the error persists, the cable may be damaged, or the scanner motor or sensor may have failed.

Step 3: Consider the Following Less-Common Causes

Although the FFC cable is the most common culprit, the following can also trigger error 100016:

• Scanner Home Sensor Failure:
  The sensor that detects the scanner's starting position can burn out or get blocked.

• Scanner Motor Jam:
  The scanner bar may be obstructed or stuck, preventing it from initializing.

• Mainboard Scanner Controller Failure:
  Rare, but possible if liquid damage or a short occurred.

When In-Depth Repair Is Needed

Addressing printer malfunctions often requires hands-on inspection and testing. Because of the mechanical nature of these issues, we're unable to provide full remote troubleshooting or repair guidance. However, we do offer in-person evaluations at our local diagnostic facility, which you can learn about here: printer repair service (https://bchtechnologies.com/printer-repair-service). Due to high demand, service is first-come, first-served and may take a few weeks before drop-off. We repair both entire printers and individual components with clear instructions on how to proceed.

That said, we understand that our rates may not fit every budget, so we strongly recommend exploring self-help resources online. A great starting point is the search function on our YouTube channel's homepage: BCH Technologies (https://youtube.com/@bchtechnologies). With nine years of video content, searching by keyword is the fastest way to locate helpful tutorials-YouTube will even suggest related videos from other creators that might guide you as well.

Thank you again for taking the time to contact us. We appreciate your patience and your support of BCH Technologies. If you have more questions or encounter other issues, feel free to reach out anytime.