Hi,
Take a look at the description below:

T55.01 is:
Analog input 5 (pin P1) related fault: analog input is not connected, or measured input value is above the maximum value.Depending on the function that is assigned to this pin:Check the wiring betweenthe controller and the device connected to this analog input. Check this device connected. Check if the calibration is done correctly recalibrate if necessary.- Temperature Sensor: controller will use the highest clipped value in its settings (which results in bad temperature compensation.- Pressure Feedback: the controller will revert to limp home mode.- Pressure Sensor: the controller will revert to shut down mode.- Other: the controller will use the lowest clipped value.