Cause: Encoder Thermal Sensor Error comes when the thermal sensor monitoring function has detected a thermal sensor error on the encoder module analog input due to "open circuit" or "short circuit".

"tECF" fault in Schneider ATV950 drive indicate " Encoder Thermal Sensor error". This means an issue with a specific temperature sensor (Th) within the encoder assembly. This sensor is crucial for monitoring the encoder's operating conditions and preventing damage due to overheating.

1. Verify the sensor and its wiring.
2. Ensure the temperature sensor is securely connected and there are no signs of damage to the wiring.
3. Use a multimeter to check if the sensor is producing a voltage output within the expected range.
4. Check the encoder's operating temperature to ensure it's within the specified limits.