The signal is lower than the minimum threshold. This happens if the sensor wires are reversed (swapping positive and negative on a thermocouple) or if the ambient temperature is below the sensor's capability.
Press . An "AT" light will likely begin to blink on the display. fourtech temperature controller manual free
If your Fourtech controller encounters an issue, it will display a specific error code on the PV display rather than a temperature reading. The signal is lower than the minimum threshold
Ensure that thermocouple extension wires are being used rather than standard copper wire, as copper will introduce parasitic junctions and cause incorrect readings. 💡 Best Practices for Long-Term Operation An "AT" light will likely begin to blink on the display
Detailed instruction manuals for specialized units like the FC-040 series are available from component suppliers. You can also find a comprehensive Fourtech Temperature Controller Guide on Scribd.