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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?

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  • $\begingroup$ 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. $\endgroup$ Oct 13, 2020 at 19:52
  • $\begingroup$ You wrote "I found out when a feeler gauge touched the bed and the hotend at the same time." - what happened? $\endgroup$ Oct 13, 2020 at 19:53
  • $\begingroup$ 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. $\endgroup$ Oct 14, 2020 at 1:29
  • $\begingroup$ 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? $\endgroup$ Oct 14, 2020 at 1:42
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    $\begingroup$ 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. $\endgroup$
    – Perry Webb
    Oct 16, 2020 at 13:36

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

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    $\begingroup$ Thanks for posting your own solution! Please accept this answer (possible after 48 hours)! $\endgroup$
    – 0scar
    Nov 1, 2020 at 10:33

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