I'm working with a USB_Dewpoint controller since a couple of weeks. First it was working quite nice, but a couple of days ago a nasty bug with channel one began
to show up: Heat output in manual mode cannot be set anymore. Clicking
the set button with - say 100% - the value falls back to 0%
immediately. Sometimes, after clicking the button for a dozen times,
the value settles to 64%. In automatic mode, however, the device seems
to work flawlessly.