AS Series Module Manual 
4- 30 
4.5  Troubleshooting 
4.5.1  Error Codes 
Error 
Code 
Description 
D 
 A LED 
Indicator 
ERROR LED 
Indicator 
16#1605 
Hardware failure    OFF  ON 
16#1607 
The external voltage is abnormal.  OFF  ON 
16#1608 
The factory calibration is abnormal.  OFF  ON 
16#1801 
The external voltage is abnormal.  OFF  Blinking 
16#1802 
Hardware failure  OFF 
Blinking 
16#1804 
The factory calibration is abnormal.  OFF 
Blinking 
- 
When power-on, the module is not detected by CPU module.  OFF 
Blinking once 
or twice and 
after 2 
seconds, it 
blinks 
repeatedly 
 
4.5.2  Troubleshooting Procedure 
Description  Procedure 
The external voltage is abnormal. 
Ensure the external 24 V power supply to the module is 
functioning normally. 
Hardware failure  Return the module to the factory for repair. 
Internal error 
The factory calibration is abnormal. 
Contact the factory. 
When power-on, the module is not detected by 
CPU module. 
Check if the connection between module and CPU 
module is working. If not, connect again.