This prompt indicates that the chamber thermal sensor has detected a possible open circuit condition that may cause the chamber temperature to not be read correctly.
Check the wiring: ensure that the thermistor wiring of the chamber is stable, and check whether it is loose or falling off.
Replace the sensor: If the problem persists after inspection, the chamber thermal sensor may need to be replaced to restore normal function.
Check the cables to the chamber thermal sensor to ensure that the connection is secure.
If the cable is loose, re-insert the cable.
If the problem is still unresolved, consider replacing the chamber thermal sensor.
Restart the device and check whether the chamber temperature can be read.