Siemens alarm 25022: Axis %1 encoder %2 warning %3
SINUMERIK axis/spindle alarm · Siemens 840D/810D powerline
What it means
The specified encoder reports a diagnostic warning identified by code %3, for example a marginal signal condition reported by intelligent absolute encoders. Operation may continue for a limited time, but the warning should be diagnosed before it escalates into a hard measuring-system fault.
Likely causes
- encoder internal self-diagnostics warning (amplitude, temperature, supply)
- transmission/checksum irregularities on serial encoder protocols (EnDat)
- connector contact resistance increasing with vibration
- encoder approaching end of life
Triage note: Log the code %3 value when reporting the fault; it identifies the encoder-internal warning class.
Replacement parts
We supply the following units for this alarm — tested, warranty-backed:
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6FX2001 series absolute encoder
encoder · Common cause
Need the part urgently?
Send us alarm 25022 with your machine details — typical RFQ turnaround is 24–48h.