The measured temperature is below the range of the sensor or the sensor is disconnected. Troubleshooting Tips
Specific terminals for Thermocouples (K, J, E type) or RTDs (Pt100). fourtech temperature controller manual
The "AT" light on the faceplate will blink. The controller will now "learn" the thermal dynamics of your machine. The measured temperature is below the range of
Small LEDs (usually labeled OUT, ALM, or AT) that show if the heater is active, if an alarm is triggered, or if "Auto-Tuning" is in progress. 2. Basic Configuration and Wiring if an alarm is triggered
Once the light stops blinking, the controller has saved the optimal PID settings. 6. Common Error Codes