Cause : Thermal sensor error comes when internal temperature sensors are monitored for short circuit or open circuit. This means the internal device thermal sensor is not operating correctly.

"INFB" Internal error 11 fault in Schneider ATV950 drive indicate "thermal sensor issue". This means drive internal thermal sensor faulty. If a "short circuit" or "open circuit" is detected, the INFB error is triggered.

1. Check drive internal circuit.
2. Check drive power card.