<p>I presume the bed doesn't feel hot, therefore something is interfering with the printer's ability to sense it's bed temperature.</p>
<p>Two possibilities come to mind:</p>
<ol>
<li><p>The bed's temperature sensor is broken/damaged or otherwise returning a false reading.  In this case, replacement of that sensor is your only option.</p>
</li>
<li><p>The wiring is damaged between sensor and mainboard.  Given the printer is at least 5 years old, that's a lot of flexing on the wire and terminations.</p>
</li>
</ol>
<p>If I were you, I'd turn the printer over, open the mainboard cover, and identify the leads to the bed's thermistor.  And the leads to the print-head thermistor.  Take a photo, and then disconnect the leads.</p>
<p>Then get a multimeter, set to Ohms, and compare the resistance of each thermistor.  They should be around 100 kOhms when at room temperature.   If you're getting close to 0 or &quot;many megaohms&quot; then the sensor is faulty and needs replacement.   Compare resistance of both thermistors to make sure you're getting a good value and  your method is sound.</p>
<p>If the resistance is close to zero then you have a short.  That may be through a gap in the wiring, but is more likely a dead sensor.</p>
<p>If the resistance is super high, that could easily be a break in the wire.  Pull the wires out and look for sharp bends/kinks.  If the wire is faulty, you may get away with replacing the wires to the existing sensor.  Do use stranded wire no-thinner than your existing wires.</p>
<p>Good luck !</p>
<hr />
<p>This may be helpful, but it is talking about a print-head thermistor:</p>
<p><div class="youtube-embed"><div>
                <iframe width="640px" height="395px" src="https://www.youtube.com/embed/pnvcAumZOug?start=0"></iframe>
            </div></div></p>

CC BY-SA 4.0
2024-11-26T01:07:37.930Z
2024-11-26T01:07:37.930Z
Criggie
<p>While I was printing my printer randomly started letting out a long loud beep. So, I turned it off and on now every time I turn it on it gives that error message and won’t let me do anything else. I tried to replace the thermistor on the hot end but it keeps on showing the error code. I think I have to replace the thermistor on the bed but I’m not sure how to do that.</p>
<p><a href="https://i.sstatic.net/bMiAooUr.jpg" rel="nofollow noreferrer"><img src="https://i.sstatic.net/bMiAooUr.jpg" alt="enter image description here" /></a></p>

<creality-ender-3><thermistor><bed>
Ender 3 shut down with ”Err: MAXTEMP: Bed"
Kaylee Thomas
# Ender 3 shut down with ”Err: MAXTEMP: Bed"

(Asked by: username_0 on 2024-11-25)

While I was printing my printer randomly started letting out a long loud beep. So, I turned it off and on now every time I turn it on it gives that error message and won’t let me do anything else. I tried to replace the thermistor on the hot end but it keeps on showing the error code. I think I have to replace the thermistor on the bed but I’m not sure how to do that.

[![enter image description here](https://i.sstatic.net/bMiAooUr.jpg)](https://i.sstatic.net/bMiAooUr.jpg)

**Tags:** creality-ender-3, thermistor, bed


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## 1 answers

### Answer by username_1 on 2024-11-26. Score: 4

I presume the bed doesn't feel hot, therefore something is interfering with the printer's ability to sense it's bed temperature.

Two possibilities come to mind:

1. The bed's temperature sensor is broken/damaged or otherwise returning a false reading. In this case, replacement of that sensor is your only option.
2. The wiring is damaged between sensor and mainboard. Given the printer is at least 5 years old, that's a lot of flexing on the wire and terminations.

If I were you, I'd turn the printer over, open the mainboard cover, and identify the leads to the bed's thermistor. And the leads to the print-head thermistor. Take a photo, and then disconnect the leads.

Then get a multimeter, set to Ohms, and compare the resistance of each thermistor. They should be around 100 kOhms when at room temperature. If you're getting close to 0 or "many megaohms" then the sensor is faulty and needs replacement. Compare resistance of both thermistors to make sure you're getting a good value and your method is sound.

If the resistance is close to zero then you have a short. That may be through a gap in the wiring, but is more likely a dead sensor.

If the resistance is super high, that could easily be a break in the wire. Pull the wires out and look for sharp bends/kinks. If the wire is faulty, you may get away with replacing the wires to the existing sensor. Do use stranded wire no-thinner than your existing wires.

Good luck !

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This may be helpful, but it is talking about a print-head thermistor:


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