<h2 style="text-align:justify">W&amp;H Alegra HE-43 Troubleshooting: 7 Questions to Ask Before You Send It for Repair 
&nbsp;</h2>

The HE-43 is working&mdash;but not quite the way it used to. That&#39;s one of the most common situations where troubleshooting becomes useful. Instead of immediately deciding that the handpiece needs a major repair, start with seven questions. The W&amp;H Alegra HE-43 is a 1:1 straight handpiece with a twist-tension chucking system for &Oslash;2.35 mm handpiece and contra-angle burs. It operates at a maximum drive speed of 40,000 rpm and connects according to ISO 3964. 
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Those specifications give you a useful starting point when something changes. 
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<h2 style="text-align:justify">1. Is the Bur Correct? 
&nbsp;</h2>

Start with the simplest variable. 
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The HE-43 is designed for &Oslash;2.35 mm handpiece and contra-angle burs. 
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Check: 
&nbsp;

<ul>
	<li>
	bur size,
	</li>
	<li>
	bur condition,
	</li>
	<li>
	shank condition,
	</li>
	<li>
	contamination,
	</li>
	<li>
	and seating. 
	&nbsp;
	</li>
</ul>

Then try a known-good compatible bur. If the problem disappears: The original bur may have been contributing to the symptom. If the problem remains: Move on to the handpiece itself. Don&#39;t replace or repair internal components based only on the first symptom. 
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<h2 style="text-align:justify">2. Is the Bur Being Held Normally? 
&nbsp;</h2>

Because the HE-43 uses a twist-tension chuck, bur retention deserves specific attention. 
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Ask: 
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Does the chuck feel the same as it normally does? 
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If it suddenly feels loose, excessively tight or inconsistent, note the change. If you continue to have retention problems with a known-good compatible bur, stop relying on the handpiece clinically until the issue is understood. 
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The <a href="https://repair.dental/repairguru/handpieces/wh-alegra-contra-angle-troubleshooting-guide">W&amp;H Alegra Contra-Angle Troubleshooting Guide</a> can help you work through related Alegra chuck and performance symptoms. 
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<h2 style="text-align:justify">3. Did the Sound Change? 
&nbsp;</h2>

A change in sound is often more useful than the volume itself. 
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Ask: 
&nbsp;

<ul>
	<li>
	Is the sound new?
	</li>
	<li>
	Did it appear suddenly?
	</li>
	<li>
	Is it present throughout rotation?
	</li>
	<li>
	Does it occur with more than one bur?
	</li>
	<li>
	Is vibration present at the same time? 
	&nbsp;
	</li>
</ul>

A new sound combined with vibration is more concerning than a simple difference in sound caused by another external factor. 
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If the sound persists, consider professional assessment rather than repeatedly running the handpiece. 
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<h2 style="text-align:justify">4. Is There Vibration? 
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Try to describe the vibration rather than simply calling it &ldquo;vibration.&rdquo; 
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Is it: 
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mild or strong? 
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constant or intermittent? 
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present with different burs? 
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getting worse? 
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Use this simple guide: 
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<table align="center">
	<tbody>
		<tr>
			<th style="text-align: justify;">
			Pattern
			</th>
			<th style="text-align: justify;">
			What to do
			</th>
		</tr>
		<tr>
			<td style="text-align:justify">
			Only one bur
			</td>
			<td style="text-align:justify">
			Check/replace bur
			</td>
		</tr>
		<tr>
			<td style="text-align:justify">
			Several compatible burs
			</td>
			<td style="text-align:justify">
			Investigate handpiece
			</td>
		</tr>
		<tr>
			<td style="text-align:justify">
			Vibration + new sound
			</td>
			<td style="text-align:justify">
			Arrange assessment
			</td>
		</tr>
		<tr>
			<td style="text-align:justify">
			Vibration + heat
			</td>
			<td style="text-align:justify">
			Stop unnecessary testing
			</td>
		</tr>
		<tr>
			<td style="text-align:justify">
			Vibration keeps returning
			</td>
			<td style="text-align:justify">
			Consider repair
			</td>
		</tr>
	</tbody>
</table>

 
If you&#39;re seeing multiple symptoms together, <a href="https://repair.dental/contact">contact Repair.Dental</a> and explain the complete pattern rather than sending only the words &ldquo;HE-43 vibrating.&rdquo; 
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<h2 style="text-align:justify">5. Is It Getting Hot? 
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Heat should be considered alongside the other symptoms. 
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For example: 
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Heat alone: investigate operating conditions. 
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Heat + vibration: stronger reason for inspection. 
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Heat + unusual sound: investigate promptly. 
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Heat + resistance: stop unnecessary use. 
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Don&#39;t keep running a handpiece repeatedly just tosee whether the heat becomes worse. 
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If the HE-43 is noticeably overheating, you can <a href="https://www.repair.dental/services/handpiece-repair/w-and-h-dental-handpiece-repair">request W&amp;H handpiece repair</a> and provide the symptom history. 
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<h2 style="text-align:justify">6. Did Maintenance Actually Fix It? 
&nbsp;</h2>

This question can save a lot of wasted troubleshooting. 
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Imagine: 
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HE-43 becomes noisy &rarr; maintenance &rarr; temporarily quiet &rarr; noise returns. 
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The temporary improvement doesn&#39;t necessarily mean the maintenance process was successful. 
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The recurrence may be the more important clue. 
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Review the <a href="https://repair.dental/repairguru/handpieces/wh-alegra-contra-angle-maintenance-guide">W&amp;H Alegra Contra-Angle Maintenance Guide</a> and confirm that your routine is appropriate. 
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If the same mechanical symptom keeps returning, it&#39;s time to consider professional diagnosis. 
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<h2 style="text-align:justify">7. Is the Problem Actually Getting Worse? 
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This is the question that determines whether you should keep troubleshooting. 
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<h3 style="text-align:justify">Stable and minor. Monitor and review routine care. 
&nbsp;</h3>

<h3 style="text-align:justify">Persistent. Investigate further.</h3>

<h3 style="text-align:justify"> 
Progressively worse. Arrange professional assessment.</h3>

<h3 style="text-align:justify"> 
Multiple symptoms together. Don&#39;t continue unnecessary testing. 
&nbsp;</h3>

At that point, the <a href="https://repair.dental/repairguru/handpieces/wh-alegra-contra-angle-repair-guide">W&amp;H Alegra Contra-Angle Repair Guide</a> becomes more relevant than trying another random maintenance step. 
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<h2 style="text-align:justify">What Not to Do 
&nbsp;</h2>

Avoid: 
&nbsp;

<ul>
	<li>
	repeatedly running a vibrating handpiece,
	</li>
	<li>
	forcing a questionable bur into the chuck,
	</li>
	<li>
	assuming every sound means bearing failure,
	</li>
	<li>
	applying unapproved products,
	</li>
	<li>
	continuing clinical use because &ldquo;it still works,&rdquo;
	</li>
	<li>
	or dismantling the handpiece without the appropriate expertise. 
	&nbsp;
	</li>
</ul>

For general care reminders, see <a href="https://repair.dental/repairguru/handpieces/simple-dos-and-donts-for-handpiece-care">Simple Do&#39;s and Don&#39;ts for Handpiece Care</a>. 
&nbsp;

<h2 style="text-align:justify">Give the Repair Team a Useful Description 
&nbsp;</h2>

If the HE-43 needs professional attention, send more than the model number. 
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A useful description might be: 
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&ldquo;Alegra HE-43 has developed increased vibration and a rough sound. The problem occurs with two different compatible &Oslash;2.35 mm burs and remains after routine maintenance.&rdquo; 
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That gives the technician something to work with immediately. 
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If you are ready to have the instrument evaluated, <a href="https://www.repair.dental/services/handpiece-repair/w-and-h-dental-handpiece-repair">start a W&amp;H handpiece repair request</a>. 
&nbsp;

If you aren&#39;t sure whether the symptom requires repair, <a href="https://repair.dental/contact">contact Repair.Dental through WhatsApp or chat</a> first and explain what you&#39;re seeing. 
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<h2 style="text-align:justify">The Best Troubleshooting Question 
&nbsp;</h2>

Don&#39;t ask only: 
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&ldquo;Is my HE-43 broken?&rdquo; 
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Ask: 
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&ldquo;What changed, when did it change, and does the same change happen under different conditions?&rdquo; 
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That approach gives you better information, avoids unnecessary part assumptions, and helps determine when the handpiece needs professional attention. 
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And when the symptoms stop being minor, don&#39;t wait for complete failure to make the call.

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<hr />
For more insights on professional dental equipment repair, please visit&nbsp;<a href="https://repair.dental/">Repair.Dental</a> or follow us on&nbsp;<a href="https://www.facebook.com/repair.dental">Facebook</a> &amp;&nbsp;<a href="https://www.instagram.com/repair.dental/">Instagram</a>.

Troubleshooting a W&H Alegra HE-43? Check bur compatibility, chuck retention, unusual sounds, vibration, heat, and recurring symptoms.

W&H Alegra HE-43 Troubleshooting: 7 Problems to Check