The device’s temperature sensor is incorrectly connected, the device’s cover is not properly closed, or an internal part is defective.
Check the following:
- Make sure the cover is properly attached to its case.
- Check if the wires are correctly connected.
Perform a reset of the circuit breaker.
- Find the circuit breaker connected to the unit.
- Disable it.
- Wait about 30 seconds.
- Reactivate the circuit breaker.