What the 1030 alarm means

In AUT/EXT mode the controller expects an external START edge that never arrived, so the selected program does not run. This is one of the faults our repair team handles on KUKA KRC2 / KRC4 / KRC5 (KSS) systems — the cause is usually identifiable within the first on-site inspection.

Most common causes

  • Start button or PLC start bit not asserted, or not edge-triggered
  • $EXT_START polarity changed after a KSS upgrade (behavior differs between KSS 8.2 and 8.3+)
  • START input wiring broken
  • Program not in reset state (pointer not at main)
Field note: the first item on this list is what we find most often on real machines. Check it before you go deeper.

Step-by-step field fix

  1. Verify the PLC or start button actually toggles the $EXT_START input
  2. Use an edge-triggered start pulse in the SPS, not a latched signal
  3. Check the KSS version notes if the cell was recently upgraded
  4. Set the program pointer to main (PP to main) before starting
Safety first: never bypass safety circuits or force contactors closed. If the alarm involves E-stop chains, brakes or drive power, and you are not a trained robot technician, contact a professional — wrong moves here can cost you a robot or an injury.

Still stuck? Get an engineer on the phone — right now

Tell us the alarm code, the robot model and what was happening when the alarm came up. Our engineers run these diagnostics every day, and remote diagnosis by phone or video call is free.

Get a Free Remote Diagnosis See Repair Services

Hotline: +86-20-39029800 · WhatsApp: +86-188-1886-2860

Related System & Program alarms

1004 — File System Error 1015 — No Program Selected 1020 — Pending Message Not Acknowledged ($CONF_MESS) 15102 — SmartPad (Teach Pendant) Fault
Other brands: we also keep field-fix libraries for ABB · Yaskawa · Universal Robots and more — see the complete alarm code hub.

Frequently asked questions

QWhat does the KUKA 1030 alarm mean?

In AUT/EXT mode the controller expects an external START edge that never arrived, so the selected program does not run. In field practice it belongs to the system & program family of faults.

QCan I clear a KUKA 1030 alarm myself?

Sometimes. Work through the step-by-step checks on this page — the first listed cause is what we find most often in the field. If the alarm returns after two attempts, or the fault involves power, brakes or safety circuits, stop and call a qualified robot service engineer.

QHow fast can a Henghuan engineer help?

On-site response in the Pearl River Delta within 30 minutes to 3 hours, across mainland China in 1-3 business days, and worldwide within 2-5 business days. Remote diagnosis by phone/WhatsApp/video is available immediately.

Written by the Henghuan Robotics repair team from field service experience. Alarm descriptions are our own summary for troubleshooting reference and may vary by controller and software version — when in doubt, check your KUKA documentation or contact us. Henghuan is an independent service provider, not affiliated with or endorsed by KUKA.