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</style>
<div id="ezts"><header class="ezts-hero">
<p class="ezts-eyebrow">Troubleshooting</p>
<h1>EZ Sign® NFC Troubleshooting Guide</h1>
<p>Choose the item that best matches your issue and check them in order from top to bottom. Most update issues are caused by the NFC antenna position, phone cases, metal surfaces, or moving the phone during the update process.</p>
</header>
<aside class="ezts-important">
<div class="ezts-important-icon">!</div>
<div>
<h2>Always try writing from the back of the EZ Sign first.</h2>
<p>Smartphone NFC antenna positions and power delivery vary by model. Please remove your phone case and any MagSafe accessories, and hold your phone flat against the center of the <b>back</b> of the EZ Sign (the side without the display).</p>
</div>
</aside>
<section class="ezts-section">
<div class="ezts-section-head">
<h2 id="ezts-common">Common Checks (First Steps)</h2>
<p>Regardless of your symptoms or error codes, please check the following items first:</p>
</div>
<div class="ezts-checks">
<div class="ezts-check">
<div class="ezts-check-num">1</div>
<div><strong>Remove cases, magnets, and cards</strong>
<p>Thick cases, MagSafe accessories, wallet-style cases, and cards can block NFC communication.</p>
</div>
</div>
<div class="ezts-check">
<div class="ezts-check-num">2</div>
<div><strong>Move away from metal surfaces</strong>
<p>Updates may become unstable on metal desks, steel shelves, or metal doors.</p>
</div>
</div>
<div class="ezts-check">
<div class="ezts-check-num">3</div>
<div><strong>Place flat against the center of the back</strong>
<p>Try updating from the center of the <b>back</b> of the EZ Sign, not the display side.</p>
</div>
</div>
<div class="ezts-check">
<div class="ezts-check-num">4</div>
<div><strong>Slightly adjust the NFC position</strong>
<p>The optimal detection spot varies by smartphone. Move your phone slowly up, down, left, or right.</p>
</div>
</div>
<div class="ezts-check">
<div class="ezts-check-num">5</div>
<div><strong>Do not move until complete</strong>
<p>Updates take about 2 to 5 seconds for 2-color models, and about 30 seconds for 4-color models. Do not pull your phone away until you see the completion message or hear the completion sound.</p>
</div>
</div>
<div class="ezts-check">
<div class="ezts-check-num">6</div>
<div><strong>Test with simple data or another device</strong>
<p>Try text-only data or a different smartphone to isolate whether the issue is caused by the data or the device.</p>
</div>
</div>
</div>
</section>
<section class="ezts-section">
<div class="ezts-section-head">
<h2 id="ezts-symptom-list">Select Your Symptom</h2>
<p>Click or jump to the matching symptom below for troubleshooting steps.</p>
</div>
<div class="ezts-symptoms"><a class="ezts-symptom-link" href="#ezts-not-start"><span>Symptom 01:</span><strong>The update does not initiate</strong></a> <a class="ezts-symptom-link" href="#ezts-error"><span>Symptom 02:</span><strong>An error code appears</strong></a> <a class="ezts-symptom-link" href="#ezts-100"><span>Symptom 03:</span><strong>Progress stops around 100%</strong></a> <a class="ezts-symptom-link" href="#ezts-complete"><span>Symptom 04:</span><strong>The app says "Complete", but the screen does not change</strong></a> <a class="ezts-symptom-link" href="#ezts-color"><span>Symptom 05:</span><strong>Colors are missing, inverted, or look incorrect</strong></a> <a class="ezts-symptom-link" href="#ezts-remain"><span><b>Symptom 06:</b></span><strong>Lines or previous images remain on the screen</strong></a> <a class="ezts-symptom-link" href="#ezts-sudden"><span>Symptom 07:</span><strong>The app used to work, but suddenly stopped working</strong></a> <a class="ezts-symptom-link" href="#ezts-some"><span>Symptom 08:</span><strong>Only certain units fail to update</strong></a> <a class="ezts-symptom-link" href="#ezts-image"><span>Symptom 09:</span><strong>Text works, but images or complex designs fail</strong></a></div>
</section>
<section class="ezts-section">
<div class="ezts-section-head">
<h2 id="ezts-procedures">By Symptom Guide</h2>
</div>
<details class="ezts-case" id="ezts-not-start" open="">
<summary><span class="ezts-case-badge">01</span><span>The update does not initiate</span><span class="ezts-case-plus"></span></summary>
<div class="ezts-case-body">
<p><i>Your smartphone may not be recognizing the EZ Sign.</i></p>
<ul>
<li>
<p>Remove cases, MagSafe accessories, and cards.</p>
</li>
<li>
<p>Move away from metal surfaces.</p>
</li>
<li>
<p>Hold your smartphone flat against the center of the back of the EZ Sign.</p>
</li>
<li>
<p>Slowly slide your phone up, down, left, or right to find the sweet spot.</p>
</li>
<li>
<p>If you are using an Android device with an NFC setting, make sure NFC is enabled.</p>
</li>
<li>
<p>Try testing with a different smartphone.</p>
</li>
</ul>
<div class="ezts-note">Note: Error 11 may appear if the smartphone fails to recognize the EZ Sign before transferring image data.</div>
</div>
</details>
<details class="ezts-case" id="ezts-error" open="">
<summary><span class="ezts-case-badge">02</span><span>An error code appears</span><span class="ezts-case-plus"></span></summary>
<div class="ezts-case-body">
<p><i>Check the "Error Code Reference" table below for guidance. For any error, start by running the common checks:</i></p>
<ul>
<li>
<p>Remove cases and move away from metal surfaces.</p>
</li>
<li>
<p>Hold your smartphone flat against the center of the back of the EZ Sign.</p>
</li>
<li>
<p>Do not move the phone until complete.</p>
</li>
<li>
<p>Try again using lightweight, text-only data.</p>
</li>
<li>
<p>If possible, test with a secondary device.</p>
</li>
</ul>
<div class="ezts-warn">Note: If Error 31 or 6600 persists across multiple devices, the hardware itself may need inspection. Please contact us with a photo of the error screen and the current display status.</div>
</div>
</details>
<details class="ezts-case" id="ezts-100" open="">
<summary><span class="ezts-case-badge">03</span><span>Progress reaches nearly 100% but never finishes</span><span class="ezts-case-plus"></span></summary>
<div class="ezts-case-body">
<p>The NFC connection or power supply may have been interrupted during the final display update.</p>
<ol>
<li>Keep your phone in place until the <strong>Complete</strong> message or sound appears.<span class="PDq2pG_selectionAnchor"></span></li>
<li>For 4-color models, hold your phone in place for about <strong>30 seconds</strong>.</li>
<li>Retry from the <strong>back of the EZ Sign</strong>.</li>
<li>Remove your phone case and avoid metal surfaces.</li>
</ol>
</div>
</details>
<details class="ezts-case" id="ezts-complete" open="">
<summary><span class="ezts-case-badge">04</span><span>The app says "Complete," but the display doesn't change</span><span class="ezts-case-plus"></span></summary>
<div class="ezts-case-body">
<p class="PDq2pG_selectionAnchorContainer">The app may have finished, but the display refresh did not.<span class="PDq2pG_selectionAnchor"></span></p>
<ol>
<li>Remove your phone case and move away from metal surfaces.</li>
<li>Hold your phone against the <strong>center of the back</strong> of the EZ Sign.</li>
<li>Keep your phone in place for a few seconds after <strong>Complete</strong> appears.</li>
<li>Try another compatible device.</li>
</ol>
<div class="ezts-warn"><strong>Still not working?</strong> Send us a photo of the display and a video of the writing process.</div>
</div>
</details>
<details class="ezts-case" id="ezts-color" open="">
<summary><span class="ezts-case-badge">05</span><span>Colors are incorrect or missing</span><span class="ezts-case-plus"></span></summary>
<div class="ezts-case-body">
<p class="PDq2pG_selectionAnchorContainer">This may happen if the wrong model or template is selected, or if the update was interrupted.<span class="PDq2pG_selectionAnchor"></span></p>
<ol>
<li>Verify whether your EZ Sign is a <strong>2-color</strong> or <strong>4-color</strong> model.</li>
<li>Use a <strong>4-color template</strong> for 4-color models.</li>
<li>Make sure the background is <strong>not Transparent</strong>.</li>
<li>Retry the update without moving your phone.</li>
</ol>
</div>
</details>
<details class="ezts-case" id="ezts-remain" open="">
<summary><span class="ezts-case-badge">06</span><span>Part of the display doesn't update</span><span class="ezts-case-plus"></span></summary>
<div class="ezts-case-body">
<p>The update may have been interrupted before completion.</p>
<ol>
<li>Remove your phone case and avoid metal surfaces.<span class="PDq2pG_selectionAnchor"></span></li>
<li>Retry from the back of the EZ Sign.</li>
<li>Test with a simple text-only image.</li>
<li>Try another compatible device.</li>
</ol>
<div class="ezts-note">If the same area remains affected, contact us with a photo of the display.</div>
</div>
</details>
<details class="ezts-case" id="ezts-sudden" open="">
<summary><span class="ezts-case-badge">07</span><span> EZ Sign worked before, but now it doesn't</span><span class="ezts-case-plus"></span></summary>
<div class="ezts-case-body">
<p>Something in your setup may have changed.</p>
<ol>
<li>Remove your phone case or accessories.<span class="PDq2pG_selectionAnchor"></span></li>
<li>Avoid metal surfaces.</li>
<li>Restart the app and your phone.</li>
<li>Try a simple text-only image.</li>
<li>Test with another compatible device.</li>
</ol>
</div>
</details>
<details class="ezts-case" id="ezts-some" open="">
<summary><span class="ezts-case-badge">08</span><span>Only some EZ Signs do not work</span><span class="ezts-case-plus"></span></summary>
<div class="ezts-case-body">
<p>Compare a working and non-working EZ Sign under the same conditions.</p>
<ol>
<li>Use the same phone and image.<span class="PDq2pG_selectionAnchor"></span></li>
<li>Test in the same location.</li>
<li>Note how many units work and how many don't.</li>
</ol>
<div class="ezts-warn">If only certain units consistently fail, contact us.</div>
</div>
</details>
<details class="ezts-case" id="ezts-image" open="">
<summary><span class="ezts-case-badge">09</span><span>Text update works, but images fail</span><span class="ezts-case-plus"></span></summary>
<div class="ezts-case-body">
<p>Complex images require more data and may be less reliable.</p>
<ol>
<li>Resize images to the recommended resolution.<span class="PDq2pG_selectionAnchor"></span></li>
<li>Reduce photos, gradients, thin lines, and small text.</li>
<li>Use only <strong>Black, White, Red, and Yellow</strong> for 4-color models.</li>
<li>Start with a simple design and add elements gradually.</li>
</ol>
<p class="PDq2pG_selectionAnchorContainer"><strong>Recommended image sizes</strong><span class="PDq2pG_selectionAnchor"></span></p>
<ul>
<li><strong>4.2"</strong> – 400 × 300 px</li>
<li><strong>2.9"</strong> – 296 × 128 px</li>
<li><strong>2.13"</strong> – 250 × 122 px</li>
</ul>
<p> </p>
</div>
</details>
</section>
<section class="ezts-section">
<div class="ezts-section-head">
<h2 id="ezts-errors">Error Code Reference</h2>
<p>(Error codes are general guides and do not definitively pinpoint a single cause.)</p>
</div>
<div class="ezts-table-wrap">
<table style="width: 141.968%; height: 478.501px;">
<thead>
<tr style="height: 51.1667px;">
<th style="width: 24.7396%; height: 51.1667px;">Error Code</th>
<th style="width: 45.0068%; height: 51.1667px;">Potential Cause</th>
<th style="width: 30.1658%; height: 51.1667px;">Action to Take</th>
</tr>
</thead>
<tbody>
<tr style="height: 75.6667px;">
<th style="width: 24.7396%; height: 75.6667px;">Error 11・12</th>
<td style="width: 45.0068%; height: 75.6667px;">EZ Sign cannot be recognized, or communication is unstable before image transfer begins.</td>
<td style="width: 30.1658%; height: 75.6667px;">Remove the case, place against the back center, and adjust the NFC alignment.</td>
</tr>
<tr style="height: 75.6667px;">
<th style="width: 24.7396%; height: 75.6667px;">Error 21</th>
<td style="width: 45.0068%; height: 75.6667px;">Communication dropped while transferring image data from the phone to the EZ Sign.</td>
<td style="width: 30.1658%; height: 75.6667px;">Do not move the phone until finished; retry from the back.</td>
</tr>
<tr style="height: 75.6667px;">
<th style="width: 24.7396%; height: 75.6667px;">Error 23・32</th>
<td style="width: 45.0068%; height: 75.6667px;">NFC communication became unstable midway through the update.</td>
<td style="width: 30.1658%; height: 75.6667px;">Avoid cases and metal surfaces; retry with lightweight data.</td>
</tr>
<tr style="height: 100.167px;">
<th style="width: 24.7396%; height: 100.167px;">Error 31・6600</th>
<td style="width: 45.0068%; height: 100.167px;">NFC communication is unstable, or hardware inspection may be required.</td>
<td style="width: 30.1658%; height: 100.167px;">Test with another device. If it doesn't improve, contact support.</td>
</tr>
<tr style="height: 100.167px;">
<th style="width: 24.7396%; height: 100.167px;">Complete but screen is blank/glitched</th>
<td style="width: 45.0068%; height: 100.167px;">The phone reported success, but power delivery wasn't stable enough to finish refreshing the screen.</td>
<td style="width: 30.1658%; height: 100.167px;"><span>Remove the case, hold flat against the back, and retry.</span></td>
</tr>
</tbody>
</table>
</div>
</section>
<section class="ezts-section">
<div class="ezts-section-head">
<h2 id="ezts-android">Google Pixel, AQUOS, and Certain Android Users</h2>
</div>
<div class="ezts-device">
<h3>Updates may be unstable on certain devices due to hardware differences.</h3>
<p>Google Pixel models prior to Pixel 7, the AQUOS series, and certain other Android devices may experience unstable updates because of their internal NFC antenna placement and power output capabilities.</p>
<p>Please remove your phone case, stay away from metal surfaces, and slowly slide your phone around the center of the back of the EZ Sign. If possible, please test with a secondary smartphone.</p>
<a href="https://www.ezsign.shop/compatible-devices/">Check compatible Devices listing</a></div>
</section>
<section class="ezts-contact">
<h2>Still Not Working? Contact Us</h2>
<p>To help us resolve your issue smoothly, please have the following information ready:</p>
<ul class="ezts-contact-grid">
<li>
<p>Place of purchase & Order number</p>
</li>
<li>
<p>Product name, size, and model type (2-color / 4-color)</p>
</li>
<li>
<p>Total number of units / Number of working vs. failing units</p>
</li>
<li>
<p>Smartphone model or Windows environment</p>
</li>
<li>
<p>OS version</p>
</li>
<li>
<p>Error code (if any)</p>
</li>
<li>
<p>Current photo of the screen</p>
</li>
<li>
<p><b>A short video of the update attempt</b> (if possible)</p>
</li>
</ul>
<div class="ezts-buttons"><a class="ezts-btn is-light" href="https://www.ezsign.shop/pages/faq/">View FAQs</a> <a class="ezts-btn is-light" href="https://www.ezsign.shop/pages/app/">App Download</a> <a class="ezts-btn" href="https://santekdisplay.com/pages/ez-sign-contact">Contact us</a></div>
</section>
</div>