Siemens SITRANS TH100 Operating Instructions Manual page 190

Diagnostics and troubleshooting
11.2 Diagnostic messages
ID Symbols Message
Co Loop current fixed
CP Loop current in saturation
E4 Internal RTD sensor error
EL Electronics temperature alarm
Fb Minimum supply voltage not
reached
FL Electronics defect
Fn Error in communication with in‐
put CPU
FE Loop current read back error
190
Cause/Remedy
The loop current is being held at a fixed value and is not responding to
process variations.
Disable the simulation to return to normal operation.
The loop current has reached its upper (or lower) saturation limit and
cannot increase (or decrease) any further.
Adjust loop current scaling.
Sensor error is detected at the internal temperature sensor.
Reset the device or switch it off and back on.
If the problem persists, contact Technical Support.
Device LED flashing red: The device is operated outside its specified
temperature range.
Check the operating temperature.
Device LED lights permanently red: The device is operated outside
its specified temperature range in functional safety mode.
Check the operating temperature.
Device LED is off: A supply voltage is probably applied but still too low.
Check the power supply (at the output terminals).
If the problem persists, contact Technical Support.
Device LED lights permanently red: The device is operated below its
specified supply voltage range.
Check the power supply (at the output terminals).
Reset the device or switch it off and back on.
If the problem persists, contact Technical Support.
Defect of device electronics.
A replacement of the device is recommended.
Contact Technical Support.
An unrecoverable error occurred in the internal communication to the
input CPU.
Reset the device or switch it off and back on.
If the problem persists, contact Technical Support.
The loop current does not correspond to the expected value.
Check DAC trim settings.
Restore to factory DAC calibration.
If the problem persists, contact Technical Support.
SITRANS TH100/TH320/TH420/TR320/TR420/TF320/TF420 with 4 to 20 mA/HART
Operating Instructions, 05/2020, A5E41864807-AB