What the 20001 alarm means

The AUBO controller itself reported a system-level fault — task crash, memory fault, or internal watchdog — halting the program. Codes 2xxxx are controller-level events. This fault appears in a large share of our AUBO i-series / C-series (ARCS SDK) service tickets, and the first round of on-site checks usually finds the source.

Most common causes

  • Unhandled exception in the robot program
  • Corrupted project or configuration file
  • Power event during a write operation
  • Controller hardware fault
Field note: Most of the time the problem is the first item on the list, so ruling it out saves you half the time.

Step-by-step field fix

  1. Record the full message and any sub-code
  2. Power-cycle the controller
  3. Restore the last known-good project backup
  4. Check the 24 V control supply stability
  5. Back up everything, then escalate to service if the fault returns
Safety first: For AUBO 20001, the risk on this family is not injury but data: lose the program, parameters and calibration data and weeks of teaching work start over. On site you may carry out the first step yourself: Record the full message and any sub-code. Beyond that it is program and calibration data work - leave it to a professional.

How we diagnose system alarms on site

AUBO 20001 belongs to the system & program family. On AUBO 20001 the failing stage is AUBO SDK / ARCS interface (AUBO collaborative robot controller) on the AUBO collaborative robot controller - the software layer: corrupted program or parameter files, boot failures, version mismatch, memory and storage media. We start reading AUBO 20001 at the pendant alarm list and SDK / ARCS return codes; 1xxxx joint level, 2xxxx / 3xxxx safety and communication.

The chain involved in AUBO 20001 runs: storage media (CF / flash / disk) -> system software and firmware -> parameters and calibration data -> user programs -> runtime.

If AUBO 20001 comes with slower boots, think media: The CF card, flash or disk inside a controller has a finite life, and heavy log writing shortens it. Ageing media usually announces itself in stages: occasional read/write errors, then slow boots, then a failure to boot at all. The nasty part is that the data may already be damaged. We bring the system up from recovery media first, then salvage user programs and parameters; everything salvaged is stored in two copies, and we set the customer up with a standing backup habit afterwards.

Field notes on this page cover AUBO 20001 (Controller System Error); written by the Henghuan repair team, updated 2026-10-01.

Stalled on the diagnosis? Let an engineer help remotely

Send the alarm code, the robot model and a description of what was happening at the alarm. Our engineers handle AUBO 20001 every day, and remote diagnosis by phone/video is free.

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Related System & Program alarms

10008 — Joint Driver Internal Error (JOINT_ERR)
Same family: this code belongs to the System & program alarms family - the page collects all System & program-family codes we have handled, with the common inspection order and spares.
Other brands: we also keep field-fix libraries for ROKAE · Dobot · FANUC and more — see the complete alarm code hub.

Frequently asked questions

QWhat does the AUBO 20001 alarm mean?

The AUBO controller itself reported a system-level fault — task crash, memory fault, or internal watchdog — halting the program. Codes 2xxxx are controller-level events. This fault appears in a large share of our AUBO i-series / C-series (ARCS SDK) service tickets, and the first round of on-site checks usually finds the source. AUBO 20001 sits in the system & program family; on our work orders the highest-frequency trigger for this code is "Unhandled exception in the robot program".

QCan I clear a AUBO 20001 alarm myself?

Whether AUBO 20001 clears on its own depends on the outcome of "Record the full message and any sub-code". Finish the flow with "Back up everything, then escalate to service if the fault returns" to confirm AUBO 20001 - do not skip it. If that step is clean, the second most frequent cause on AUBO 20001 is "Corrupted project or configuration file". When AUBO 20001 keeps coming back it is not a one-off trigger - especially if Back up everything, then escalate to service if the fault returns is where you get stuck. Do not keep producing through AUBO 20001.

QWhen you handle AUBO 20001, will my programs and frames get lost?

The commonest causes we see on AUBO 20001 are "Unhandled exception in the robot program, Corrupted project or configuration file, Power event during a write operation", so we stock the van against those. For AUBO 20001 specifically, we carry recovery media and common storage media, but on this family the backup matters more than the spare. For AUBO 20001, on system alarms the first move is backup; we can walk the customer through preserving data remotely before anything else. Before we roll, tell us what AUBO 20001 shows on the pendant alarm list and SDK / ARCS return codes; 1xxxx joint level, 2xxxx / 3xxxx safety and communication and what the machine was doing - phone or video triage is free.

This page on AUBO 20001 is based on the field experience of the Henghuan Robotics repair team. Alarm explanations are our own summary for troubleshooting reference and may differ across controller and software versions — if unsure, verify against AUBO documentation or reach out to us. Henghuan is an independent service provider with no affiliation or endorsement by AUBO.