# C263A41 Invalid Sample Rate High

Alarm codes · `C263A41` · verification: source checked

Too many invalid samples are being read from the motor encoder. This points to a faulty encoder, bad connection, or EMC/ESD problem. The code includes a debt counter as an unsigned value.

## Specification

| Property | Value |
|---|---|
| Code | C263A41 |
| Meaning | The rate of invalid samples is too high; this can indicate a faulty motor encoder, a bad connection, or an EMC/ESD issue. The code reports a debt counter value. |
| Remedy | Perform a complete reboot sequence, check for possible electromagnetic noise or ESD sources, update the software, or contact your local Universal Robots service provider for assistance. |

## Connected

- Controllers: [Universal Robots e-Series Control Box](https://machineschema.com/controller/universal-robots-e-series-control-box.md)

## Sources

1. [C263 Motor Encoder](https://www.universal-robots.com/manuals/EN/HTML/SW5_26/Content/prod-err-codes/topics/CODE_263.html) (accessed 2026-10-26)

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Source page: https://machineschema.com/alarm/ur-c263a41  
JSON: https://machineschema.com/alarm/ur-c263a41.json  
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