<p>Issue is solved!</p>
<p>Root cause was a broken thermistor circuit at board and broken thermistor.</p>
<p>I disconnected all wires and power, measured board and thermistors resistance: E0 = ~120 Ω, (E1 and Bed) = ~700 Ω. I swapped pins for <code>TEMP_0_PIN</code> and <code>TEMP_1_PIN</code> within Marlin for Tevo firmware at <code>pins_RAMPS.h</code> as described in answer on question <a href="https://3dprinting.stackexchange.com/questions/10208/change-hotend-thermistor-input-in-marlin">Change hotend thermistor input in Marlin</a>, changed thermistor and everything prints fine.</p>

CC BY-SA 4.0
2020-07-22T07:27:00.750Z
2020-07-22T07:46:22.113Z
2020-07-22T07:46:22.113Z
Останин Вадим
<p>I get the error &quot;<code>Thermal runaway on E1. Reset printer.</code>&quot; today on my Tevo Tarantula when powering on the printer. The display shows the error and the speaker beeps loudly everytime I power on the printer or reset it.</p>
<p>I use the firmware
<a href="https://github.com/JimBrown/MarlinTarantula" rel="nofollow noreferrer">https://github.com/JimBrown/MarlinTarantula</a>, because I can switch E0 heat nozzle to E1 wires, without soldering; PID's for nozzle were configured, and works fine before I replaced the power supply.</p>
<p>Recently my power supply was broken, and today I installed new power supply, clean nozzle, several times start bed leveling, and on fourth time of homing error appeared.</p>
<p>Power supply voltage tested with a multimeter and the voltage of power supply is 12.06V.</p>
<p>Note: several times printer started bed leveling.</p>

CC BY-SA 4.0
2020-07-18T13:25:47.867Z
Do note that Marlin internal naming for extruders starts with 0 (zero), but, error reporting and menu use naming starting 1 (one).  Thermal runaway should only be triggered when heating the hotend. Strange that this happens when you turn on the printer or after levelling.
0scar
CC BY-SA 4.0
2020-07-18T14:51:59.627Z
Agree, it is strange. I will test ceramic heater tomorrow. I think that short circute is at ceramic heater either at hotend or board connection. I will replace it if so. I will comment result of tests.
Останин Вадим
CC BY-SA 4.0
2020-07-19T13:02:26.467Z
Issue is solved. Root cause was at broken thermistor circute at board and broken thermistor. I disconnect all wires and power, measure board nest thermistors  resistance: E0 = ~120 Oms, (E1 and Bed) = ~700 Oms. I changed pins at Marlin for Tevo pins_RAMPS.h as at https://3dprinting.stackexchange.com/questions/10208/change-hotend-thermistor-input-in-marlin, changed thermistor at everything prints fine.
Останин Вадим
CC BY-SA 4.0
2020-08-08T13:34:00.963Z
When I last updated my Ender 3 pro I also downloaded a boot loader which set certain parameters.
Ghoster
<hotend><tevo-tarantula>
Thermal runaway when power on
Останин Вадим
# Thermal runaway when power on

(Asked by: username_0 on 2020-07-18)

I get the error "`Thermal runaway on E1. Reset printer.`" today on my Tevo Tarantula when powering on the printer. The display shows the error and the speaker beeps loudly everytime I power on the printer or reset it.

I use the firmware
<https://github.com/JimBrown/MarlinTarantula>, because I can switch E0 heat nozzle to E1 wires, without soldering; PID's for nozzle were configured, and works fine before I replaced the power supply.

Recently my power supply was broken, and today I installed new power supply, clean nozzle, several times start bed leveling, and on fourth time of homing error appeared.

Power supply voltage tested with a multimeter and the voltage of power supply is 12.06V.

Note: several times printer started bed leveling.

**Tags:** hotend, tevo-tarantula
> **Comments:**
> **username_1**: Do note that Marlin internal naming for extruders starts with 0 (zero), but, error reporting and menu use naming starting 1 (one).  Thermal runaway should only be triggered when heating the hotend. Strange that this happens when you turn on the printer or after levelling.  
> **username_0**: Agree, it is strange. I will test ceramic heater tomorrow. I think that short circute is at ceramic heater either at hotend or board connection. I will replace it if so. I will comment result of tests.  
> **username_0**: Issue is solved. Root cause was at broken thermistor circute at board and broken thermistor. I disconnect all wires and power, measure board nest thermistors  resistance: E0 = ~120 Oms, (E1 and Bed) = ~700 Oms. I changed pins at Marlin for Tevo pins_RAMPS.h as at https://3dprinting.stackexchange.com/questions/10208/change-hotend-thermistor-input-in-marlin, changed thermistor at everything prints fine.  
> **username_2**: When I last updated my Ender 3 pro I also downloaded a boot loader which set certain parameters.  

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## 1 answers

### Answer by username_0 on 2020-07-22. Score: 2 | Accepted answer

Issue is solved!

Root cause was a broken thermistor circuit at board and broken thermistor.

I disconnected all wires and power, measured board and thermistors resistance: E0 = ~120 Ω, (E1 and Bed) = ~700 Ω. I swapped pins for `TEMP_0_PIN` and `TEMP_1_PIN` within Marlin for Tevo firmware at `pins_RAMPS.h` as described in answer on question [Change hotend thermistor input in Marlin](https://3dprinting.stackexchange.com/questions/10208/change-hotend-thermistor-input-in-marlin), changed thermistor and everything prints fine.


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