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1) The humidity controller will display "HHH" if too much humidity is detected.

2) The humidity controller will display “LLL” if too little humidity is detected. (Please note: The "LLL" message can appear for multiple reasons):

• The humidity sensor has not been set up. To fix: Set up your desired minimum and maximum humidity settings, then insert humidity sensor into the chamber (with the humidifer running). Wait 5 minutes.
• There is not enough humidity in the chamber. To fix: Check humidifier to confirm it has water. If controller is still reading “LLL,” lower the fan setting.
• The gray sensor probe is malfunctioning. If you still see “LLL” after entering the min/max settings, inserting the humidity probe, verifying the humidifier has water, and lowering the fan setting, then the gray sensor probe is broken.