Siemens alarm 2: Overtemperature
SINUMERIK 840C legacy alarm · Siemens 840C
What it means
The second temperature-monitoring threshold on the CSB module tripped because ambient temperature is too high. Processing is not interrupted directly, but safe functioning of the hardware can no longer be guaranteed; a contact opens on the CSB so external equipment can react.
Likely causes
- Cabinet cooling failure or clogged filters
- High ambient temperature
- CSB fan/airflow path obstructed
Need the part urgently?
Send us alarm 2 with your machine details — typical RFQ turnaround is 24–48h.