Space Pi Filament Dry Box Plus Relative Humidity not low enough

Despite operating the dryer for longer than suggested on the PACF setting the reading doesn’t go below 13 percent. Way above what is recommended by the filament maker at 4 percent. Is the unit faulty?

13% wow I wish I could hit numbers like that. 32% is the best I’ve done. Then, the Space PI Doesn’
t keep the humidity out and I have to dry again. I too suspect that there is something fundamentally wrong with the Space PI.