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.

  • $\begingroup$ 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. $\endgroup$
    – 0scar
    Commented Jul 18, 2020 at 13:25
  • $\begingroup$ 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. $\endgroup$ Commented Jul 18, 2020 at 14:51
  • 1
    $\begingroup$ 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 3dprinting.stackexchange.com/questions/10208/…, changed thermistor at everything prints fine. $\endgroup$ Commented Jul 19, 2020 at 13:02
  • $\begingroup$ When I last updated my Ender 3 pro I also downloaded a boot loader which set certain parameters. $\endgroup$
    – Ghoster
    Commented Aug 8, 2020 at 13:34

1 Answer 1


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, changed thermistor and everything prints fine.


You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .