Fatek PLCs Troubleshooting & Procedures

Step-by-step procedures

• Fatek FBs PLC — ERR LED Blink & Error Codes — On a Fatek FBs PLC the ERR LED is your first diagnostic. Solid ERR means a hardware failure; a 0.5-second blink means a main-unit error such as a watchdog timeout, program error or system error — and the Y0–Y3 outputs turn into a live error-code readout.