Code HOST-226: DHCP: Lease time expired
Issue Description & Safety Warning
The Fanuc R-30i Series Robot Controller has triggered a critical DHCP: Lease time expired 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 DHCP lease time expired and the robot could not renew the DHCP lease on the robot controller's IP address. 4.ERROR CODES B-83124EN-6/02 Remedy: Check the Ethernet cables and make sure the robot controller is still connected to the Ethernet network. Check that the DHCP server is online. Check the DHCP server configuration and verify it is able to assign IP address to the robot controller.
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 HOST-226 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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