<p>I found the solution. Controller board was broken, I had to order a new one.</p>

CC BY-SA 4.0
2020-11-01T05:31:37.053Z
2020-11-01T10:32:26.250Z
2020-11-01T10:32:26.250Z
Ramblin' Sid Rumpo
<p>I am currently building a Hypercube Evolution from a kit that was passed on to me. It uses a BIQU KFB2.0 control board and a 24 volt power supply. I have no prior experience in 3D printing.</p>
<p>I was getting to the end of the build. Everything was working. I was testing every component as I added it using Pronterface. I have not covered the aluminium heated bed with anything as I did not want to cause problems for the induction sensor (used as Z Min endstop). The induction sensor has a 4 mm range for ferrous metal and less for aluminium. I was intending to print on blue tape.</p>
<p>One website I visited suggested using feeler gauges as a better choice when levelling the bed. So I did. What I did not know is that both the hotend and the bed have power running to the outer surface. I found out when a feeler gauge touched the bed and the hotend at the same time. Since then, my LCD display gives the message &quot;Thermal Runaway E1 press reset&quot;. I have pressed reset on the control board to no avail. Short press, long (5 and 10 seconds) and double press. None of which work. I have disconnected the hotend and it's thermistor from the control board. I have tried using another thermistor, but to no avail. Pronterface, when trying to connect, gives the following two lines:</p>
<p>&quot;Error: Thermal Runaway, system stopped! Heater_ID: 0
Error: Printer halted, kill() called!&quot;</p>
<p>I have disconnected all wires from the control board other than those leading to the LCD screen. The only power coming from the PSU. Still have the Thermal Runaway E1 error.</p>
<p>I have also re-compiled Marlin 2.0.6.1 using Auto Build Marlin and uploaded to the board, still the error persists. Anybody any idea how to fix this problem?</p>

CC BY-SA 4.0
2020-10-13T19:52:36.640Z
Can you disconnect the thermistor connector at the control board and measure its resistance at that connector with a multimeter? That will check if there is a broken connection somewhere in that part of the wiring.
Andrew Morton
CC BY-SA 4.0
2020-10-13T19:53:04.283Z
You wrote "I found out when a feeler gauge touched the bed and the hotend at the same time." - what happened?
Andrew Morton
CC BY-SA 4.0
2020-10-14T01:29:09.340Z
When the feeler gauge touched the hot end and the bed at the same time, I got a few pretty yellow sparks. This is when my problems started. The thermistor for the bed shows 137 kilo-ohms. The thermistor for the hotend showed 105 ohms. I removed the thermistor from the hotend and it now shows 110 kilo-ohms.
Ramblin' Sid Rumpo
CC BY-SA 4.0
2020-10-14T01:42:10.380Z
My limited knowledge suggests that there may be a short at the hotend. Would i be correct?

I have now removed all connections from the board, other than the stepper drivers and the LCD screen. When I connect to the computer, I still get the Thermal Runaway error on the screen.The powers supply was not connected.  Pronterface will not connect. However, I can still upload firmware to the board.

Have I fried my board and if so, will I need to replace the stepper drivers as well as the board?
Ramblin' Sid Rumpo
CC BY-SA 4.0
2020-10-14T08:50:53.967Z
Sounds like your hot end thermistor is shorted / damaged. Probably an issue with its insulation.

Try plugging the heated bed thermistor in the hot end thermistor port - does it read correctly then?
towe
CC BY-SA 4.0
2020-10-15T01:00:49.730Z
Sorry towe, I have now disconnected everything from the board other than the stepper motors and the LCD Screen. The board will not connect to Pronterface and the LCD screen just reads, Thermal Runaway Error: E1, Printer Halted, Reset. So, at the moment, I cannot check. I can upload firmware to the board, so we do have communication. I have taken a closer look at the thermistor head. On one side there is about 5mm of bare wire between the head and the insulation.
Ramblin' Sid Rumpo
CC BY-SA 4.0
2020-10-16T13:36:23.453Z
Sounds like the sparks indicated a temporary short that damaged something in your circuitry used for detecting thermal runaway.  That's the place to troubleshoot.
Perry Webb
<troubleshooting><printer-building><hypercube>
Thermal Runaway E1
Ramblin' Sid Rumpo
# Thermal Runaway E1

(Asked by: username_0 on 2020-10-12)

I am currently building a Hypercube Evolution from a kit that was passed on to me. It uses a BIQU KFB2.0 control board and a 24 volt power supply. I have no prior experience in 3D printing.

I was getting to the end of the build. Everything was working. I was testing every component as I added it using Pronterface. I have not covered the aluminium heated bed with anything as I did not want to cause problems for the induction sensor (used as Z Min endstop). The induction sensor has a 4 mm range for ferrous metal and less for aluminium. I was intending to print on blue tape.

One website I visited suggested using feeler gauges as a better choice when levelling the bed. So I did. What I did not know is that both the hotend and the bed have power running to the outer surface. I found out when a feeler gauge touched the bed and the hotend at the same time. Since then, my LCD display gives the message "Thermal Runaway E1 press reset". I have pressed reset on the control board to no avail. Short press, long (5 and 10 seconds) and double press. None of which work. I have disconnected the hotend and it's thermistor from the control board. I have tried using another thermistor, but to no avail. Pronterface, when trying to connect, gives the following two lines:

"Error: Thermal Runaway, system stopped! Heater\_ID: 0
Error: Printer halted, kill() called!"

I have disconnected all wires from the control board other than those leading to the LCD screen. The only power coming from the PSU. Still have the Thermal Runaway E1 error.

I have also re-compiled Marlin 2.0.6.1 using Auto Build Marlin and uploaded to the board, still the error persists. Anybody any idea how to fix this problem?

**Tags:** troubleshooting, printer-building, hypercube
> **Comments:**
> **username_1**: Can you disconnect the thermistor connector at the control board and measure its resistance at that connector with a multimeter? That will check if there is a broken connection somewhere in that part of the wiring.  
> **username_1**: You wrote "I found out when a feeler gauge touched the bed and the hotend at the same time." - what happened?  
> **username_0**: When the feeler gauge touched the hot end and the bed at the same time, I got a few pretty yellow sparks. This is when my problems started. The thermistor for the bed shows 137 kilo-ohms. The thermistor for the hotend showed 105 ohms. I removed the thermistor from the hotend and it now shows 110 kilo-ohms.  
> **username_0**: My limited knowledge suggests that there may be a short at the hotend. Would i be correct?  I have now removed all connections from the board, other than the stepper drivers and the LCD screen. When I connect to the computer, I still get the Thermal Runaway error on the screen.The powers supply was not connected.  Pronterface will not connect. However, I can still upload firmware to the board.  Have I fried my board and if so, will I need to replace the stepper drivers as well as the board?  
> **username_2**: Sounds like your hot end thermistor is shorted / damaged. Probably an issue with its insulation.  Try plugging the heated bed thermistor in the hot end thermistor port - does it read correctly then?  
> **username_0**: Sorry towe, I have now disconnected everything from the board other than the stepper motors and the LCD Screen. The board will not connect to Pronterface and the LCD screen just reads, Thermal Runaway Error: E1, Printer Halted, Reset. So, at the moment, I cannot check. I can upload firmware to the board, so we do have communication. I have taken a closer look at the thermistor head. On one side there is about 5mm of bare wire between the head and the insulation.  
> **username_3**: Sounds like the sparks indicated a temporary short that damaged something in your circuitry used for detecting thermal runaway.  That's the place to troubleshoot.  

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## 1 answers

### Answer by username_0 on 2020-11-01. Score: 1 | Accepted answer

I found the solution. Controller board was broken, I had to order a new one.


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