Code SPOT-037: No gun contactors defined
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical No gun contactors defined alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Cause: The Gun contactor teach pendant instruction was programmed, but no gun contactors are defined. Remedy: Gun contactors are defined at Controlled start, from the Spot Config menu. If extra gun contactors are defined at Controlled start, then the Equipment I/O menu will allow you to define the I/O for the gun contactor. To perform a Controlled start: 1. Turn the controller off. 2. On the teach pendant, press and hold the PREV and NEXT keys. While you hold these keys, press the ON/OFF button on the controller. 3. Select controlled start, and press ENTER.
Source: FANUC Robot R-30iA Alarm Code List Operator's Manual
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Fanuc R-30i Series Robot Controller Alarms
Fanuc controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code SPOT-037 on the R-30i Series Robot Controller identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Fanuc's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 6553 Fanuc R-30i Series Robot Controller codes.
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