The Kobra S1 belongs to Anycubic’s current generation of printers that report faults as a numeric code rather than a plain-text message. Instead of something like “nozzle temp error” printed straight to the screen, the touchscreen shows a line such as CODE: 10124, and you’re meant to look that number up either by scanning the QR code on the error page or by searching it on wiki.anycubic.com. This is a different system from older Kobra models like the Kobra 2 Pro, which just print a description with no accompanying code. The S1 shares its numeric error index with the Kobra 3 family, the Kobra X, and the Kobra 4, though not every code applies to every model, and the exact troubleshooting steps for a given code often differ by machine even when the code number is shared.
This article is built from Anycubic’s own “Error Codes” index page, which lists every code the company has documented along with which printer models it applies to, cross-checked against the Kobra S1 specific troubleshooting pages linked from that index. Anywhere a code has a dedicated Kobra S1 page with disassembly steps, tool requirements, or specific values, that detail is included below. Anywhere only the general cause description was available, that’s noted as such rather than padded out with invented steps.
Hotend and extrusion codes
CODE: 10122 (Extruder heating abnormal) fires when the printer detects an abnormal heating condition at the hot end during warm-up and cuts power to protect the machine, ending the current print. Anycubic’s own possible causes are a loose or failed hot end heater, a poorly seated hot end wiring harness, or a failed printhead board. The documented fix starts with removing the printhead front cover, disconnecting the cooling fan connector, and checking whether the hot end cable at the rear of the printhead is fully seated (reseat it if not). If the code returns, the next step is to open Control, then Temperature, set the nozzle to 55°C, and watch the indicator LED on the printhead board: solid means it’s heating, flashing means target temperature has been reached and is being held, and off means the printhead mainboard itself is likely the problem. This needs an H2.0 Allen key.
CODE: 10124 (Extruder NTC abnormal) means the print head’s thermistor isn’t reporting a usable temperature reading. Anycubic’s guide has you power down, remove the print head housing (unplug the cooling fan cable first), and check whether the NTC cable is loose, reseating it if so. If that doesn’t clear it, the next check is the print head connection cable itself, both at the print head module and again where it plugs into the adapter board. A reader comment on the wiki page notes a broken thermistor wire as an underlying cause in at least one case, which isn’t in Anycubic’s own text but is consistent with the failure mode described.
CODE: 10107 (Abnormal filament / filament broken) behaves differently depending on whether an ACE Pro multi-color unit is connected. In monochrome printing with the break-detection switch on, this fires when the extruder’s filament-break sensor doesn’t detect filament. With an ACE Pro attached, the break-detection switch is controlled by the ACE Pro’s own logic instead, and the code fires when the ACE Pro itself recognizes a break. Anycubic’s fix sequence is: manually feed filament into the extruder first, then check that the break-detection sensor sits correctly above the filament, and finally check whether the filament hub inlet is blocked (this requires removing it with an S2.0 Allen key, clearing it, and reinstalling).
Anycubic’s error index also lists CODE: 10131 (Nozzle Mcu abnormal), described generally as a loose print head cable, but at the time of writing there’s no Kobra S1 specific troubleshooting page live at the expected URL, only pages for the Kobra 3 and Kobra X lines. If you hit 10131 on an S1, the general fix implied by the other models’ pages is checking the print head cable and its connector.
Bed heating and leveling codes
CODE: 10121 (Hotbed heating abnormal) is a heated-bed heating fault. The Kobra S1 page has you power down, remove the four-input/one-output module and the rear cover (S2.0 Allen key), then check the hot bed cable where it plugs into the hot bed adapter board, reseating it if loose. To confirm the fix, heat the bed to 50°C and watch the blue indicator light on the mainboard: on during heating, flashing once target temperature is reached, and off means the bed itself is faulty and needs replacing.
CODE: 10123 (Hotbed NTC abnormal) is the bed-side equivalent of 10124: the hot bed’s thermistor circuit isn’t reporting properly. The documented path is to power down, remove the back cover (removing the plug-detection cable and its fixing screws first, then the teflon tube), and reseat the hot bed NTC cable on the mainboard. If the fault persists, Anycubic’s next step is replacing the hot bed assembly entirely, and if that doesn’t resolve it either, replacing the mainboard (removing the cooling fan fixing plate and four mainboard screws to swap it).
CODE: 10120 (Z-axis homing failed) covers a family of Z-axis zeroing problems. If this shows up right out of the box, Anycubic’s first suggestion is checking whether the three screws holding the hot bed were left loose during shipping and tightening them with an S2.5 Allen key. Beyond that, the path is to remove the back cover and cooling fan fixing plate (S2.0 Allen key), reseat the Z-axis motor connector on the mainboard, and if the fault continues, measure continuity across the Z-axis motor cable with a multimeter in buzzer/continuity mode. No tone means a bad cable. If the cable and motor both test fine, the last thing to check is the strain gauge assembly behind the print head case, looking for a loose or deformed cable at the adapter plate.
CODE: 10237 (Auto leveling error, sometimes labeled “verify the leveling sensor”) is the code current-firmware Kobra S1 units show for a failed auto-leveling pass (older firmware reportedly used CODE: 11534 for the same condition, per Anycubic’s index). The diagnostic starts by triggering Z-axis homing and watching whether the bed pauses just before the hot end makes contact, which confirms the leveling sensor is responding. If the bed doesn’t pause and actually touches the nozzle, Anycubic says to cut power immediately to avoid damage. From there, the check moves to the strain gauge assembly wiring inside the print head housing (H2.0 and H2.5 Allen keys needed), then the leveling sensor assembly’s mounting screws, and finally a check for debris or moisture around the strain gauge and cutter assembly. Anycubic also flags that leftover print waste stuck to the underside of the bed can throw off the strain gauge readings over time, which is worth ruling out before opening the printer up.
Related to this is CODE: 11532 (Device lacks automatic leveling), which fires when the printer was force-shut-down before it finished its initial leveling pass at startup. The documented fix is simply powering the printer on again and letting the startup leveling routine run to completion instead of interrupting it.
Multi-color and ACE Pro codes
The base Kobra S1 prints single color. Multi-color printing and active filament drying require the separate ACE Pro unit (sold as the “Kobra S1 Combo” bundle or as an add-on), and a cluster of codes in the 114xx-115xx range are specific to that connection.
CODE: 11538 (Cutter signal error) is specific to the S1’s integrated filament cutter, a feature not present on every Kobra model. The wiki’s fix is to first manually check that the cutter physically springs back to its rest position after being triggered; if it doesn’t reset, the cutter itself likely needs replacing. If the cutter resets fine, the fault points to the signal cable: remove the print head case and rear shell (S2.0 Allen key) and reseat the cutter’s signal cable at the adapter plate, being careful not to plug it into the adjacent filament-break-detection connector by mistake, since the two connectors sit next to each other. User comments on this page describe the fault triggering specifically when the cutter mechanism gets activated at the front-right homing position but the filament in the channel prevents the blade lever from springing back to open, which lines up with Anycubic’s own description of the failure.
CODE: 11511 (Extrusion abnormal) and CODE: 11512 (Retraction abnormal) both relate to the ACE Pro’s filament path: the printer doesn’t see filament reach the print head within the expected time (11511) or doesn’t see it clear during retraction (11512). Anycubic’s stated cause for both includes filament that’s undersized in diameter, where the feed gear can’t get enough grip to drive it reliably.
CODE: 11518 (Filament clogging detected) and CODE: 11519 (Filament tangle detected) both pause the print rather than stopping it outright. 11518 is a physical jam in the feed path; Anycubic again calls out undersized filament diameter as a contributing cause alongside actual clogs. 11519 means filament has tangled inside the ACE Pro spool bay and needs to be manually sorted out before resuming.
CODE: 11521 (Abnormal rotation of the color engine motor) means the ACE Pro’s internal filament-selector motor failed to return to its zero position, and Anycubic’s fix is simply power-cycling the ACE Pro unit.
CODE: 11529 (ACE Pro NTC abnormal) and CODE: 11530 (ACE Pro PTC abnormal) are the ACE Pro’s own temperature-sensing faults, tied to its filament-drying function. 11530 specifically halts drying and Anycubic recommends only servicing it with the unit powered off.
CODE: 10412, 10413, and 10414 are all listed by Anycubic under the same generic description (“An issue occurred”) with the same fix: manually restart the printer and reseat the ACE Pro signal cable. CODE: 10000 (Unknown error) gets the identical instruction. These are the least descriptive codes in the whole system, and Anycubic’s own documentation doesn’t differentiate what triggers one versus another beyond that shared ACE Pro connection angle.
CODE: 10409 (Device runtime error) is a broader communication fault that isn’t limited to the ACE Pro. It fires when the printer detects a software exception or a communication breakdown between any of the main unit, ACE Pro, mainboard, driver board, or printhead board. Anycubic’s troubleshooting sequence, in order: power-cycle the ACE Pro and printer together and try resuming the print; if that fails, reseat the ACE Pro’s signal cable; if that fails, open the rear cover (H2.0 Allen key, removing the four-in-one-out module first) and check the mainboard-to-driver-board wiring; and if that still doesn’t clear it, open the print head housing and check the mainboard-to-printhead-board connection. Anycubic also documents a log export tool (“Kobra S1 Fault Log Export Guide”) for cases that survive all four steps.
CODE: 10411 (TMC or extruder overheat) points to insufficient cooling at the mainboard’s stepper drivers, and CODE: 11412 (mainboard MCU and driver MCU disconnected) and CODE: 11817 (E-axis motor module possible short circuit) both point to wiring or driver-chip level faults on the motion control side. Anycubic’s index lists these as applicable to the S1 but doesn’t currently host S1-specific disassembly pages for them the way it does for 10409 and 10120, so the detail available is limited to the cause description.
Connectivity, storage and file codes
CODE: 10105 (File download failed) covers both local storage and WiFi problems, since the S1 downloads sliced files from Anycubic’s cloud service before printing. If local storage is full, the fix is deleting old files from the printer’s storage screen. If it’s a WiFi issue, Anycubic’s page walks through checking the firmware is current, confirming the router broadcasts on 2.4GHz (the S1 doesn’t support 5GHz), verifying the WiFi password was typed correctly, and, for unstable-but-connected cases, checking signal strength in Settings, then Cloud Platform, then WLAN. Anycubic states normal signal strength runs from about -40dBm to -80dBm, and recommends moving the printer closer to the router once it drops below -80dBm.
CODE: 10115 (The device cannot parse the file) almost always comes down to a corrupted or misnamed G-code file. Anycubic’s fix is to reslice and save the file fresh rather than trying to repair a damaged one, make sure the file ends in .gcode rather than being an unsliced model file, avoid special characters in the filename, and keep the file no more than two folder levels deep on the USB drive. On the storage side, Anycubic caps supported USB drives at 128GB and recommends formatting as FAT32 with a 4096-byte allocation unit if the printer won’t read the drive at all.
CODE: 11101 (WiFi connection failed) is specifically a bad password entry rather than a signal problem: go to Network, then WLAN, select the network, and re-enter the password carefully. A cloud icon appearing in the top right of the screen confirms both the WiFi and the cloud server connection succeeded.
Other connectivity and storage codes Anycubic lists as applicable to the S1, described generally on the index page without a dedicated S1 walkthrough at the time of writing, include CODE: 10106 (insufficient local memory), CODE: 10113 (downloaded file failed an MD5 checksum verification against the cloud copy), CODE: 10116 (a slicing-software parameter error produced a bad slice), CODE: 10801 through 10805 (firmware download, update, storage, external-drive mount, and verification failures during an OTA update), and CODE: 11001 (the printer failed to delete a local file, usually a storage-health question).
Camera, detection and print-task codes
CODE: 11802 (Foreign object detected) relies on the S1’s built-in camera rather than any laser or LiDAR scanning hardware. Anycubic describes the process in detail: after the X and Y axes home, the bed rises in stages while the camera captures up to three images at different heights, each sent to Anycubic’s cloud for AI inference before the printer decides whether an object is present. Anycubic states the detection zone can pick up objects as small as roughly 9.5 by 9.5 by 3cm at a distance and 5 by 1.2 by 0.8cm up close, though it notes actual detection varies with bed height and position. The fix is checking for actual debris or scratches on the plate, confirming you’re using the standard black spring steel plate rather than a transfer or cold plate (which can trigger false positives), cleaning the plate, and releveling.
CODE: 11801 (messy printing / “fried noodles” detected) is the related spaghetti-detection code, using the same camera-and-cloud-AI pipeline to catch a failed print mid-job and pause it before it wastes more filament.
CODE: 10134 (feature requires camera access) appears when AI inspection or time-lapse photography is enabled but the printer doesn’t detect a connected camera. CODE: 11402 (network connection timed out) and CODE: 11404 (video stream startup failed) are both monitoring-feature errors tied to network status rather than the camera hardware itself.
On the print-task side, codes 10101 through 10104 are status codes rather than hardware faults (there’s already a task running, there’s no task to act on, the task is suspended, or the task has stopped), and Anycubic doesn’t attach troubleshooting steps to them since they’re informational. CODE: 10111 (Task abnormally ended) does have a Kobra S1 page (shared with the Kobra 3 series) and points to checking slicer settings before restarting the print. CODE: 10133 (missing necessary commands) means the slicer output is incomplete and needs to be resliced with correct parameters. CODE: 10537 (Nozzle size mismatch) fires when the nozzle diameter set in the slicer doesn’t match what’s configured on the printer itself, since the S1 supports swapping between 0.4mm (standard), 0.6mm, and 0.8mm nozzles.
The Kobra S1 shares its numeric CODE: 10xxx error index with the rest of Anycubic’s current lineup. See the Anycubic Kobra 3 Max Error Code Index for another current-generation Kobra model documented under the same numbering scheme.