Why does Hach Measuring Instruments show error E-01?
- JJoseph EverettAug 20, 2025
Error E-01 on Hach Measuring Instruments indicates that the system detects too much ambient light. Ensure the instrument cap is fully installed over the cell holder. You can also check the service log for other error messages, inspect the cell compartment for ambient light sources, check the instrument cap for defects, and verify the light detection system is working. If needed, replace the cell compartment or detector.