<p>Yes there are ways to tune false positives. For Marlin firmware you can find these option in the <a href="https://github.com/MarlinFirmware/Marlin/blob/2.0.x/Marlin/Configuration_adv.h" rel="nofollow noreferrer">Configuration_adv.h</a> file.</p>

<p>From the file itself you can read what you need to do:</p>

<blockquote>
<pre><code> * If you get false positives for "Thermal Runaway", increase
 * THERMAL_PROTECTION_HYSTERESIS and/or THERMAL_PROTECTION_PERIOD
 */
</code></pre>
</blockquote>

CC BY-SA 4.0
2020-04-06T21:15:58.677Z
Any recommendations for how to go about increasing both settings? One before the other, increased symmetrically?
ifconfig
CC BY-SA 4.0
2020-04-06T21:38:35.453Z
To be honest, I don't know the underlying problem of this, just try to experiment with one at a time.
0scar
CC BY-SA 4.0
2020-04-06T21:13:49.873Z
2020-04-06T21:13:49.873Z
0scar
<p>I've noticed an interesting behavior on my Ender 3 with SKR Mini E3 mainboard and Marlin 2.0.x bugfix firmware. (<em>otherwise, all other hardware is entirely stock</em>) After the hotend/bed are commanded to cool down, e.g. after a print completes, I have to wait until after they both cool down to ambient before commanding another temperature setpoint.</p>

<p>If I don't do this, the printer most often triggers thermal runaway protection. (<em>usually citing the extruder, but also sometimes the bed</em>) I think this might be due to the thermal inertia in the material between the heater and thermistors, causing a 5-10 second delay in sensed temperature rise. I don't see any reason why thermal runaway should trigger; the Octoprint temperature graph looks completely normal, with no perceptible anomalies.</p>

<p>Is there some way to tune parameters for thermal runaway protection to alleviate this false-positive situation?</p>

<marlin><creality-ender-3><troubleshooting><skr-mini-e3>
Thermal runaway triggers when raising temperature amid cooldown
ifconfig
# Thermal runaway triggers when raising temperature amid cooldown

(Asked by: username_0 on 2020-04-06)

I've noticed an interesting behavior on my Ender 3 with SKR Mini E3 mainboard and Marlin 2.0.x bugfix firmware. (*otherwise, all other hardware is entirely stock*) After the hotend/bed are commanded to cool down, e.g. after a print completes, I have to wait until after they both cool down to ambient before commanding another temperature setpoint.

If I don't do this, the printer most often triggers thermal runaway protection. (*usually citing the extruder, but also sometimes the bed*) I think this might be due to the thermal inertia in the material between the heater and thermistors, causing a 5-10 second delay in sensed temperature rise. I don't see any reason why thermal runaway should trigger; the Octoprint temperature graph looks completely normal, with no perceptible anomalies.

Is there some way to tune parameters for thermal runaway protection to alleviate this false-positive situation?

**Tags:** marlin, creality-ender-3, troubleshooting, skr-mini-e3


---

## 1 answers

### Answer by username_1 on 2020-04-06. Score: 1 | Accepted answer

Yes there are ways to tune false positives. For Marlin firmware you can find these option in the [Configuration\_adv.h](https://github.com/MarlinFirmware/Marlin/blob/2.0.x/Marlin/Configuration_adv.h) file.

From the file itself you can read what you need to do:

> ```
>  * If you get false positives for "Thermal Runaway", increase
>  * THERMAL_PROTECTION_HYSTERESIS and/or THERMAL_PROTECTION_PERIOD
>  */
>
> ```

> **Comments:**
> **username_0**: Any recommendations for how to go about increasing both settings? One before the other, increased symmetrically?  
> **username_1**: To be honest, I don't know the underlying problem of this, just try to experiment with one at a time.  

---

