EZ Sign Trouble Shooting

Troubleshooting

EZ Sign NFC Troubleshooting Guide

Select the symptom that matches your issue and check the items in order from top to bottom. Most update issues are caused by NFC antenna position, phone cases, metal surfaces, or movement during the writing process.

Initial Common Checks

Regardless of your symptoms or error codes, please check the following items first:

1
Remove cases, magnets, and cards

Thick cases, magnetic accessories, wallet-style cases, and cards can block NFC communication.

2
Keep away from metal surfaces

Writing may become unstable on metal desks, steel shelves, or metal doors.

3
Place tightly against the center-back

Try placing your phone against the center area of the back of the EZ Sign, not the display side.

4
Slightly adjust the NFC position

The optimal response position varies by smartphone model. Slowly move it up, down, left, or right.

5
Do not move until complete

Expect about 2 to 5 seconds for 2-Color models, and about 30 seconds for 4-Color models. Do not separate until completion appears/sounds.

6
Test light data or another device

Isolate data and device issues by testing text-only data or using a different smartphone.

Select Your Symptom

Click a symptom to jump directly to its troubleshooting steps.

Symptom 01Writing does not start Symptom 02An error code is displayed Symptom 03Stops near 100% Symptom 04Shows Complete, but screen doesn't change Symptom 05Colors or display look wrong Symptom 06Lines or previous display remain Symptom 07Used to work, but suddenly stopped working Symptom 08Only specific EZ Sign units fail to update Symptom 09Only images or complex designs fail

Step-by-Step by Symptom

Open the relevant item and try the steps from top to bottom.

01Writing does not start even when holding the smartphone over it

Your smartphone may not be successfully recognizing the EZ Sign.

  1. Remove your phone case, magnetic accessories, and cards.
  2. Move away from any metal surfaces.
  3. Place your smartphone tightly against the center of the back of the EZ Sign.
  4. Slowly shift your smartphone's position up, down, left, and right.
  5. For Android devices with NFC settings, verify that NFC is enabled.
  6. Try using a different smartphone.
Error 11 may appear if the smartphone fails to recognize the EZ Sign before image data transfer begins.
02An error code is displayed

Check the "Error Code List" below for guidelines on specific codes. For any code, perform the initial common checks first.

  1. Remove cases and keep away from metal surfaces.
  2. Press your smartphone tightly against the center of the back of the EZ Sign.
  3. Do not move the phone until complete.
  4. Retry using lightweight, text-only data.
  5. If possible, test with a secondary device.
If errors 31 or 6600 persist across different devices, your hardware status may need to be checked. Please take a photo of the error screen and current display state when contacting support.
03Progress reaches near 100% but does not complete

NFC communication or power supply may be dropping out during the final display refresh process.

  1. Keep holding your phone in place even after reaching 100%, until you see/hear completion confirmation.
  2. For 4-Color models, maintain contact for about 30 seconds.
  3. Retry writing from the back of the EZ Sign.
  4. Remove your case and avoid metal surfaces.
04App says "Complete" / write finished, but the EZ Sign screen doesn't change

Even if the smartphone thinks it's finished, the final display refresh might not have fully finished. This can also happen due to insufficient NFC power supply.

  1. Remove cases and accessories.
  2. Move away from metal surfaces.
  3. Hold your smartphone tightly against the center of the back of the EZ Sign.
  4. Keep it in place for a few extra seconds after completion.
  5. Check if the same symptom occurs with another device.
If the screen still doesn't change using a second device, a hardware check is required. Please reach out to support with a photo of the current screen and a video of the writing process.
05Red/yellow won't appear, colors are inverted, or display colors look incorrect

Communication may have dropped halfway, model settings might not match your data, or background color settings could be interfering.

  1. Check the label on the back of the unit to confirm whether it's a 2-Color or 4-Color model.
  2. Make sure you select 4-Color compatible templates or data if using a 4-Color model.
  3. Check if the background color is set to "Transparent".
  4. Remove your case, hold against the back, and rewrite without moving until complete.
06Only part of the screen updates, or lines/previous images remain

NFC communication or power delivery likely dropped midway through the write.

  1. Remove your case and move away from metal surfaces.
  2. Retry writing from the center-back of the EZ Sign.
  3. Test using simple text-only data.
  4. Check if lines or ghost images appear in the exact same spot using a different device.
If display flaws persist in the exact same location after rewriting with a different device, please contact support with a photo of the screen.
07It used to work fine, but suddenly stopped working

Changes in environment, cases/accessories, NFC placement, data type, OS/app updates, or hardware status may be factors.

  1. Check if you are using a different phone case or accessory than before.
  2. Ensure you are away from metal surfaces.
  3. Test with lightweight, text-only data.
  4. Restart your app and smartphone.
  5. Check if the same issue happens on another device.
08Out of multiple units, only certain EZ Sign units fail to update

Compare units that work versus units that fail using the exact same device, data, and location.

  1. Use the same smartphone and data.
  2. Use the same desk and posture.
  3. Confirm whether errors occur exclusively with the failing unit.
  4. Keep a record of the total units, successful units, and failing units.
If the symptoms consistently target specific individual units, a hardware check may be necessary.
09Text works fine, but images or complex designs fail

Communication may become unstable due to heavy data size or image conversion processing.

  1. Adjust your images to recommended resolutions.
  2. Reduce heavy photographs, fine gradients, thin lines, and tiny text.
  3. For 4-Color models, design primarily using black, white, red, and yellow.
  4. Start with text-only data and slowly add elements to isolate what triggers failure.
  • 4.2 inch: 400 × 300 px
  • 2.9 inch: 296 × 128 px
  • 2.13 inch: 250 × 122 px

Error Code List

Error codes do not definitively pinpoint a single cause but serve as a guide to isolate where the failure occurred.

Display Potential Cause First Steps
Error 11 / 12 EZ Sign could not be recognized, or pre-transfer communication is unstable Remove case, adjust NFC position at the center-back
Error 21 Communication dropped while transferring image data from the smartphone Do not move until complete, retry from the back
Error 23 / 32 NFC communication became unstable midway through writing Avoid cases/metal surfaces, retry with lighter data
Error 31 / 6600 NFC communication is unstable, or unit hardware status requires checking Verify with another device; contact support if unresolved
Post-Complete Display Glitch Phone marked it complete, but power supply was unstable during the final refresh Remove case, press firmly against back and rewrite

For Google Pixel, AQUOS, and Select Android Users

Updates may be unstable depending on your device model

Models prior to Google Pixel 7, the AQUOS series, and certain other Android phones may experience unstable updates due to their NFC antenna locations or power output capacities.

Please remove your phone case, stay away from metal surfaces, and slowly nudge your phone around the center-back of the EZ Sign. If possible, test with an alternative device.

View our tested and compatible device list

Still Not Resolved? Contact Us

To help us assist you smoothly, please have the following information ready:

  • Store / Order Number
  • Product Name, Size, 2-Color / 4-Color
  • Number of affected units
  • Smartphone model or Windows environment
  • OS Version
  • Error Code(s)
  • Photo of current screen display
  • Video of the writing process (if possible) 
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