What the 0x0F0102 alarm means

An E-stop input is active; servo power is cut as designed. If no button is pressed, the safety loop itself has a fault. This is one of the faults our repair team handles on JAKA Zu / JAKA Pro cobots (APP) systems — the cause is usually identifiable within the first on-site inspection.

Most common causes

  • Pendant or external E-stop pressed
  • E-stop loop wiring open
  • Safety relay fault
  • External safety device holding the loop open
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. Release every E-stop in the cell
  2. Press safety reset after release
  3. Meter the E-stop loop if the alarm stays
  4. Check external safety devices (scanners, mats)
  5. Re-enable and test the enable switch before running
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.

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

Related Safety Chain & E-Stop alarms

0x000035 — Collision Detected 0x0F0103 — Safety I/O Configuration Error
Other brands: we also keep field-fix libraries for AUBO · ROKAE · Dobot and more — see the complete alarm code hub.

Frequently asked questions

QWhat does the JAKA 0x0F0102 alarm mean?

An E-stop input is active; servo power is cut as designed. If no button is pressed, the safety loop itself has a fault. In field practice it belongs to the safety chain & e-stop family of faults.

QCan I clear a JAKA 0x0F0102 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 JAKA documentation or contact us. Henghuan is an independent service provider, not affiliated with or endorsed by JAKA.