Detcon FP-100 - Manual (Page 28)

Model FP-100
FP-100 Instruction Manual Rev. 0.0 Page 24 of 30
Faulty 4-20mA Output (F03)
Check that wiring is properly connected at terminal board and through to controller inputs.
The 4-20 output loop must be closed (resistance of < 750 ohms).
If the 4-20mA signal output is 0mA to 2mA, there is an ITM fault.
Swap with new ITM to determine if the ITM is faulty.