Siemens SITRANS 7MF03.0 - Page 17

ID Symbols Message Cause/Remedy
Fb Supply voltage below limit
Maintenance demanded
The supply voltage is too low.
Make sure input voltage is within product speci󹪝cation.
FC Supply voltage above limit
Maintenance alarm
The supply voltage is too high.
Make sure input voltage is within product speci󹪝cation.
FE Loop current read back er‐
ror
Maintenance demanded
The loop current does not correspond to the expected value.
No fault current is output.
Causes:
• The current output is incorrect.
• The DAC trim settings are incorrect.
• The transmitter electronics is defective.
Remedy:
• Check the loop current with a battery or another 24V voltage source.
• Check DAC trim settings or restore to factory DAC calibration.
• Replacing the transmitter electronics.
FJ Process conditions outside
the speci󹪝cation
Process value warning
Uncertain values due to process conditions.
Check installation for abnormal operating conditions.
Fn Connection failure to sen‐
sor electronics
Maintenance alarm
Causes:
• The sensor electronics is not connected correctly with the transmitter
electronics.
• The sensor electronics is defective.
Remedy:
• Check whether the connection between the sensor electronics and trans‐
mitter electronics is correct.
• Replace the measuring cell.
Fo Sensor break
Maintenance alarm

The pressure transducer of the measuring cell is defective.
Replace the measuring cell.
Fr Internal power supply is
out of allowable range.
Process value warning
Defect in the internal voltage supply.
Replace the transmitter electronics.
Diagnostics and troubleshooting
4.1Diagnostic messages
SITRANS P320/P420
Service Manual, 11/2023, A5E44914141-AC 17