The Fanuc 0i-Model F (0i-F) is the current-generation compact CNC used on a huge range of machining centres and lathes. Like the 0i-D and the 30i/31i series, it shows each alarm with a letter prefix identifying the system area. Here are the codes technicians meet most often, with causes and fixes.
How 0i-F Alarm Codes Are Structured
- PS — Program / setting (parameter) alarms
- SV — Servo alarms • SP — Spindle alarms
- OT — Overtravel • OH — Overheat
- APC / DS — Absolute encoder alarms • SR — Serial comms
Common 0i-F Alarms
| Alarm | Meaning | Common Cause & Fix |
|---|---|---|
| PS0000 | Please turn off power | A parameter needing a power cycle was changed. Switch the machine OFF and ON. |
| PS0100 | Parameter write enable | PWE = 1 on the SETTING screen. Set PWE = 0 and press RESET. |
| PS0101 | Please clear memory | A parameter needing a memory clear was changed. Power on holding RESET + DELETE (back up first). |
| SV0401 | Servo amplifier VRDY (ready) OFF | Amp not ready — check DC link voltage, E-stop, amp power and the fault LED. Repair/replace the drive if faulty. |
| SV0410 / SV0411 | Excessive position error (stop / move) | Mechanical bind, overload, low gain, or amplifier/motor fault. |
| SV0417 | Illegal digital servo parameter | Servo parameters corrupted (often after battery loss). Restore from backup; replace battery A98L-0031-0025. |
| SV0436 | Soft thermal (OVC) | Overload or blocked cooling. Check cooling fans and mechanical load. |
| SV0445 / SV0447 | Encoder soft / hard disconnect | Feedback lost. Inspect the cable/connector; replace a faulty encoder. |
| OT0500 / OT0501 | Stored stroke limit + / − exceeded | Jog back inside the travel range and reset. |
| OH0700 | Control unit overheat | Check the cabinet cooling fan and ambient temperature. |
| APC0300 / APC0301 | Reference return required / APC comms error | ABS position lost after battery change. Redo zero-return; check encoder cable & battery. |
Need the Part — or a Repair?
If a 0i-F alarm points to a failed servo drive, encoder, board or power supply, JJ Automation stocks new and tested used/refurbished Fanuc spares — 100% checked before dispatch — plus board-level repair.
- 🛒 Browse Fanuc 0i-F parts, servo drives and PCB boards
- 📞 Call / WhatsApp: +91 8802212394 ✉ jj.automation@outlook.com 🌐 www.jjautomation.in
Quick-reference of common alarms. For the complete list, refer to the Fanuc 0i-F Maintenance Manual.