How to Fix Epson ET-8550 Printer Error 031006: Mainboard and Printhead Troubleshooting Guide

Customer Question:
My Epson ET-8550 printer suddenly displayed error code 031006. I had recently been performing printhead cleanings. What does this error mean, and how can I fix it?

Answer:

What Is Epson Error Code 031006?

Error 031006 on the Epson ET-8550 typically points to a mainboard failure or communication issue, often resulting from one or more of the following:

• Ink flooding onto the FFC (flat flexible cable) or printhead contacts

• A damaged or shorted mainboard

• Loose, misaligned, or corroded cable connections

• Power surge or static electricity affecting circuit stability

• Excessive internal pressure from repeated cleanings without rest cycles

In some cases, this error may appear right after performing multiple back-to-back head cleanings. Doing too many cleans in a row can force ink to drip onto the cable contacts or mainboard area, causing short circuits or high resistance paths, which then trip the internal error handling system.

Step-by-Step Troubleshooting for Error 031006

If this error appears, stop all printing immediately and proceed carefully with the following steps:

Step 1: Power Down and Rest

• Turn off the printer and unplug it from the power source.

• Let it sit for 15–30 minutes to allow any residual internal pressure or electrical charges to settle.

Step 2: Inspect for Ink Leaks

• Open the top of the printer and carefully examine the printhead bay and cable areas for signs of ink puddles, smears, or residue.

• Focus on the area where the printhead cable (FFC) meets the carriage board. Ink here can cause communication faults.

Step 3: Access the Mainboard

• If you're comfortable disassembling your unit, uncase the printer following your model's service manual or one of our instructional videos.

• Once you’ve removed the side panels, locate the mainboard—typically on the lower left or rear panel of the chassis.

Step 4: Remove and Inspect the Mainboard

• Carefully disconnect all ribbon cables, noting their locations for reassembly.

• Unscrew and remove the board.

• Inspect the board for:

  • Burnt fuses (F1, F2)

  • Damaged capacitors

  • Scorched or discolored components

  • Signs of ink splatter or corrosion

Even a tiny ink drop or oxidation spot can disrupt signals and trigger Error 031006.

Step 5: Clean and Reconnect

• If no damage is found, gently clean the board and connectors with isopropyl alcohol (at least 90%) and a soft brush.

• Reconnect all cables securely and in the correct orientation.

Step 6: Component-Level Troubleshooting (Advanced Users)

If you have electronics experience, check:

• F1 and F2 fuses for continuity

• Capacitors and nearby transistors like B12

• Look for cold solder joints or swollen components

If you suspect mainboard failure but are unable to identify the specific issue, you can send the board to BCH Technologies for diagnosis and repair.

Important Note on Cleaning Practices

Please avoid repeated head cleanings in succession. Doing so increases internal pressure and can lead to ink flooding the printhead or cable connectors—precisely what likely caused this issue. Always allow several minutes between cleanings, and perform manual priming if needed instead of relying solely on software-based cleans.

Addressing printer issues can be a complex task that often requires hands-on work. Unfortunately, we're unable to offer remote repair or live support. However, we do offer an in-person evaluation and printer repair service (https://bchtechnologies.com/printer-repair-service) through our local diagnostic center. Given current demand, repairs are handled on a first-come, first-served basis, and it may take several weeks before we can receive your unit. We provide services for both full printer restoration and individual component diagnostics. That said, we understand that our repair rates may not be ideal for every situation. For those looking to explore self-repair, we highly encourage utilizing online resources, including our YouTube channel homepage (https://youtube.com/@bchtechnologies). Use the search tool located next to the “About” tab for quicker results on specific repair videos. YouTube’s algorithm may also show related videos from other channels that could prove helpful.

Thank you again for your trust in BCH Technologies. We truly value your engagement and hope this information guides you toward a resolution. Please don’t hesitate to reach out again with further questions or updates.