List of error codes for the IC-FR3000/FR4000 series.

Error Codes Description

ALT1 Warning Code of the abnormalities in temperature of the final stage of the transmitting circuits. (I.e. It displays when the temperature of the final stage of the transmitting circuits increases due to condition of the antenna.) PA Unit Temp. Check the temperature settings in the software. Cause - PA over heating or PA is going bad.
ALT2 Warning Code of the abnormalities in temperature with the power supply. Regulator Unit Temp
ALT3 Warning Code of the PLL unlock in transmit.
ALT4 Warning Code of the PLL unlock in reception.

01HALT34 Out Of Freq Range This means ALT3 and ALT4