Hardware Model Specification
NVIDIA DGX H100 Diagnostics
Classification: AI Accelerators & HPC Servers Equipment
Hardware operational fault codes, protection alarms, LED blink sequences, and step-by-step diagnostic fixes for the NVIDIA DGX H100.
1 Documented Faults
•
Full Multimeter & Safety Isolation Procedures
Indexed Fault Codes for DGX H100
Step-by-step resolution manuals and root cause matrices
CODE SXid 120
Severity: Critical
Difficulty: Advanced
NVSwitch Fatal Credit Timeout
SXid 120 indicates an unrecoverable credit timeout on an NVSwitch NVLink port, meaning an internal receiver buffer did not replenish transmission credits within the hardware-enforced threshold, stalling crossbar fabric traffic and forcing an NCCL communication abort.
⏱ 45-90 Mins
Troubleshoot Now →