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Siemens SINAMICS G120 F30004: Overtemperature heat sinkCites the manual · line-by-line check pending
What it means Inverter heat sink got too hot.
Safety Safety disclaimer: General information only, written in plain English by an experienced maintenance hand. It is not the manufacturer's instructions. Always follow the OEM manual, your site procedures and local electrical codes. Only qualified people should work on this equipment.
LOTO LOTO: Lock out and tag out all energy sources before touching wiring, motors or mechanics. Wait the drive's stated DC bus discharge time and verify zero energy with a meter before you work.
Likely causes Fan failure Dirty heatsink Hot cabinet Checks, in order Clean, check fans and ambient Source Source (reworded, not copied): Siemens, SINAMICS G120 Control Units CU240B-2/CU240E-2 List Manual, 02/2023, A5E33839529, section 4.2 List of faults and alarms. Official manual (PDF) . Fault numbers and names can differ between firmware versions.