Code ISD-021: Low pressure (sup-%s) (ISD%d)
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical Low pressure (sup-%s) (ISD%d) 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: This error is posted when the system detects inadequate pressure in the second material supply. This condition is usually caused by one or more of the following: z The supply line (hose, etc.) has been removed. z The low pressure limit value was set too high. z The low pressure time out value was set too short. Remedy: z Make sure the supply line is ok. z Make sure the low pressure limit value is appropriate. z Make sure the low pressure time out value is appropriate.
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 ISD-021 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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