What the TeachComm alarm means

The controller loses communication with the WMS pendant; the screen freezes or the pendant reboots, and teaching/jogging becomes impossible. This is one of the faults our repair team handles on Staubli CS8 / CS9 (VAL3) systems — the cause is usually identifiable within the first on-site inspection.

Most common causes

  • Damaged pendant cable or connector
  • 24 V instability affecting the pendant link
  • Pendant hardware failure
  • Controller pendant-port fault
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. Reseat and inspect the pendant cable and connector
  2. Swap-test with a known-good pendant
  3. Check the 24 V rail stability
  4. Power-cycle the controller
  5. Replace the pendant or repair the port based on the swap result
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 Communication alarms

Fieldbus33 — Internal Error on Fieldbus Board — Status 33
Other brands: we also keep field-fix libraries for Epson · Nachi · Omron and more — see the complete alarm code hub.

Frequently asked questions

QWhat does the Staubli TeachComm alarm mean?

The controller loses communication with the WMS pendant; the screen freezes or the pendant reboots, and teaching/jogging becomes impossible. In field practice it belongs to the communication family of faults.

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