The SV06 is Sovol’s entry level, Ender-3 class printer: a bedslinger with a direct drive extruder, a 220 x 220 x 250mm build volume, a small LCD with a rotary knob, and a factory installed inductive style leveling probe for automatic bed mesh compensation. It runs a Marlin fork that Sovol publishes on GitHub as Sv06-Source-Code, alongside the mechanical files in SV06-Fully-Open-Source. There is no separate proprietary display firmware doing code translation. When something goes wrong, the screen just prints the raw Marlin string, the same kind of text you would see on a Creality Ender-3 or any other stock Marlin machine of this era.
This is a different animal from the Sovol SV08, which is a CoreXY machine running Klipper. The SV08 reports faults through Klipper’s console and MCU shutdown messages, which look and behave nothing like what is described here. If you found this page while troubleshooting an SV08, you are in the wrong guide. The same is true of the Sovol SV07, which also runs Klipper (on a CoreXZ frame with a separate host computer) and reports faults the Klipper way, not with the Marlin text cataloged here.
Sovol’s own documentation for the SV06 is thin. The user manual covers assembly, the touchscreen menu tree, and the mainboard wiring diagram, but it does not include a troubleshooting or error section at all. Sovol’s Help Center, download page, and the official wiki likewise have no dedicated SV06 error reference. Nearly everything usable for building an accurate picture of what these messages mean comes from Sovol’s own support forum, where Sovol staff (posting under the account name sovol3d) have answered specific error reports, plus the open firmware source.
How to read the message
There is no numbered code, no “Exxx” lookup table, and no QR code linking to a knowledge base. When the SV06 halts, the screen shows a short line or two of text, usually something like Err: MINTEMP: E1, PRINTER HALTED, or Please reset. These strings come straight out of Marlin’s error handling and describe the failure directly rather than pointing you at a reference number. If you search Sovol’s site for “SV06 error code list” you will not find one, because it does not exist. Treat any message you see on this printer as a literal, plain English (or occasionally garbled English) description of what the firmware detected.
Heating and thermistor faults
This is where almost all of the SV06’s documented failures live, and it is almost always a wiring or thermistor problem rather than a firmware bug.
Err: MINTEMP: E1 (hotend) or Err: MINTEMP: Bed, usually followed by PRINTER HALTED and Please reset. Marlin throws this when the thermistor circuit reads outside the expected resistance range, either open (disconnected) or shorted. On a brand new SV06 the most common cause, confirmed repeatedly on Sovol’s own forum, is a hotend cable that was never plugged back in after assembly. On a printer with some months of use, it is usually a broken or fatigued thermistor wire. One well documented case traced the bed thermistor’s MINTEMP error to both copper leads snapping from metal fatigue at the exact point where the bed cable flexes every time the bed moves to the back of the build plate, about 4 inches from where the wires solder onto the bed. The thermistor itself tested fine on a multimeter; the wire had failed invisibly under the insulation.
First check: open the extruder shroud and confirm the hotend thermistor connector is fully seated, then check the bed cable at both the mainboard end and the bed end for a snug fit. Gently wiggle the cable near the kink point at the back of the bed while watching the temperature reading. If the display flickers or the number jumps, you have found a wire fault.
Escalation: swap the nozzle and bed thermistor connectors at the mainboard. If the MINTEMP error moves from bed to nozzle (or vice versa), you have confirmed which thermistor or cable is actually bad, since this is the exact diagnostic Sovol’s own support engineer has told users to run on the forum. Replace the thermistor or the wire itself (a used USB cable’s copper coated steel wire has been reported as a more flex resistant DIY replacement than the stock copper leads). If the part is still under warranty, Sovol’s process asks for your printer’s serial number (found on the underside of the power supply) and a photo or short video of the fault before shipping a replacement bed or thermistor.
??? or err showing instead of a numeric temperature. This is the same underlying fault as MINTEMP, just caught before the printer fully halts. Sovol’s own troubleshooting steps for this, given directly on the forum, are to unplug the thermistor and see what value the display shows, then swap the nozzle and bed thermistor cables and see if the abnormal reading follows the wire or stays with the component. Same first check and same escalation path as above.
Thermal runaway, reported on the SV06 as the printer halting mid print, commonly around the ten minute mark, with a thermal runaway message referencing the E1 (hotend) heater. Marlin trips this when a heater is commanded on but the measured temperature does not rise (or overshoots) within its expected window, which almost always means a failing thermistor or a failing heater cartridge rather than a software problem. First check: reseat and inspect the thermistor as above. If the thermistor tests fine, the heater cartridge itself, or the full hotend assembly, is the next suspect. Sovol sells a complete all metal hotend kit (heat block, nozzle, thermistor, heater, heat break, silicone sock) as a low cost replacement rather than sourcing individual parts.
Homing and auto bed leveling faults
The SV06 uses an inductive style leveling probe mounted next to the nozzle. Sovol’s manual walks through the leveling sequence (Auto Z-Align, then Bed Leveling, which preheats the nozzle to 120C and the bed to 60C before probing) but says nothing about what happens when it fails.
In practice, failures during probing do not throw a labeled error message, the printer just stops mid sequence, sometimes with the probe light staying lit even after contact, sometimes with the nozzle or gantry physically crashing into a limit stop partway through the probe grid. Users have reported this both as the probe failing to register contact reliably (nozzle presses into the bed but the sensor light does not go out) and as the probe head overshooting its expected travel and grinding against the belt or gantry.
First check: confirm the small set screw next to the probe has not been over tightened, since tightening it changes the probe’s height relative to the nozzle rather than just locking it in place, and over tightening is a documented way users have made a working setup worse. Recheck the Z-offset after any adjustment.
Escalation: from the on screen menu, run Configuration, then Advanced Settings, then Initialize EEPROM. This restores the firmware’s default settings into the working memory Marlin actually reads from, and it is the fix Sovol’s own forum account has repeatedly pointed users toward for leveling and calibration weirdness that does not resolve with mechanical checks. If a firmware reflash and an EEPROM reset both fail to fix erratic or crashing probe behavior, treat it as a hardware fault in the probe or its wiring and contact support.
EEPROM and firmware faults
Err: EEPROM Version, sometimes with on screen options to Reset or Ignore that do not actually clear the error and instead reboot back into the same message. This shows up when the settings structure saved in EEPROM does not match what the currently running firmware expects, most often after flashing a firmware build (Sovol’s own updated release, or a community Marlin build) that changed configuration options since the printer’s last save. Note that Sovol has shipped SV06 mainboards using at least two different processor variants (STM32 and GD32) across production runs, and firmware built for the wrong variant, or firmware from the wrong upstream branch, is a documented cause of this exact loop.
First check: from the menu, run Initialize EEPROM to force the firmware to write fresh default values rather than trying to reuse the old saved table.
Escalation: if the error persists, confirm you flashed the firmware file that actually matches your printer’s mainboard revision and processor. Sovol’s Download page under Help Center hosts the manuals and firmware. If you are using a third party or upstream Marlin build instead of Sovol’s own release, go back to Sovol’s official firmware first before assuming the board is faulty.
Filament runout
The base SV06 does not ship with a filament runout sensor installed. Sovol sells one separately as an add on kit (filament runout sensor and bracket roller), and the mainboard does expose a dedicated connector for it in the wiring diagram, but out of the box there is no runout detection and therefore no runout message to document on a stock machine. If you have added the accessory sensor or a third party equivalent, be aware the forum has multiple reports of the stock sensor design causing false triggers from its filament curve, or in some cases not triggering a pause at all, and neither is something Sovol has published an official message or code for. Treat runout related pauses (or the lack of them) as a mechanical or wiring problem with the add on sensor itself rather than a firmware fault.
Fans and other subsystems
Sovol’s manual documents the mainboard’s normally open fan port and controllable fan port in its wiring diagram, but neither the manual nor the forum turned up a documented, specific fan fault message for the SV06. If a fan stops spinning you will not get a named error for it, you will just see the downstream symptom (heat creep, layer adhesion problems, or in a worst case a thermal runaway if the hotend cooling fan dies during a print). This is a gap in Sovol’s own documentation, not something this guide is filling in with a guess.
When to stop troubleshooting and contact Sovol support
Sovol’s support channel is email, info@sovol3d.com, and the same address is used for both technical troubleshooting and warranty claims. Have your printer’s serial number ready (printed on the underside of the power supply) along with your order number and, ideally, a photo or short video of the fault, since that is what Sovol’s support engineers ask for before diagnosing or shipping replacement parts.
Warranty terms per Sovol’s own Help Center: one year on the printer itself, three months on the extruder unit specifically, and one month on accessories. Print plates and nozzles are treated as consumables and are not covered. If a thermistor, heater, or bed keeps failing after you have done the wiring and continuity checks above, that is the point to email support rather than keep replacing parts yourself, particularly if the printer is still inside its first year.