Thermistor Error After Boot

Sovol SV04 IDEX
1

After finishing a print on the Sovol Sv04 IDEX, I turned off the machine to rest. When turning it on again, I came across the error “Thermistor Error” right at boot time. Between one print and another, nothing was done other than turning the printer off and turning it back on after a while, as I always do, after printing for a longer period of time. An image of the error is attached.

20250127_112552
20250127_1125521848×4000 1.81 MB

2

Hi,
What is the temperature in the room where is located the printer ?
If it’s too cold, this message is normal. It’s why I have placed my printer in a warmed enclosure.

3

In case of room temperature above 0°C this error screen indicates connection problems between motherboard and both nozzle + hot-bed thermistors. Loosing all three connections at once seems quite unlikely. Checking the connections between power supply and motherboard could help.

Good luck!
Björn

4

Hi,
I had this problem with an ambient temperature of about 7-8°C.
After warming the enclosure to more than 20°C, everything was back to normal even if I’m not sure it’s the real problem.

5

Good evening, I’m also having this problem with the thermistor 0/0 and the ambient temperature being 32°. Did you find a solution for you? How did you manage to fix it? I can’t boot the firmware; it freezes on the screen and restarts the board, and it won’t connect to the laptop.

svl04
svl04447×799 54.9 KB

6

Hello XXADRIANOXX & welcome to the forum,
the error message indicates temp errors of hot-bed or nozzle(s).

Nozzle check:
Examine heating cables and thermistor wires at each extruder:

  • are all cables in place with electrical contact to heater / thermistor?
  • is the insulation of the cables intact & free of crossovers (short circuits)?
  • are the other ends of the cables still plugged in?
  • are the cables free of any metal parts (e.g. extruder / blower housing) squeezing them?

Hot-bed check:
Unscrew & unplug the hot-bed Gx16-5 plug at the back of your SV04. Test the electrical resistance of the heater & the thermistor using a multimeter: The plug has 5 connector pins. Pin 1 & 2 at the right side of the plug connect the heater, measurement should show in 2.6 ohms.
Pin 4 & 5 at the left side of the plug connect the bed thermistor, measurement should show around 72 kilo ohms at 32°C.
In case of 0 ohms between pin 4 & 5 there is a short circuit that can be solved as shown here.

If all the above is O.K. then you need to check the electrical resistance of the nozzle thermistors using a multimeter, too. It is described here.

Good luck!
Björn