I don't think Danfoss makes complete fridges or even kits?
Best to specify the make & model, maybe a link.
Are you saying the compressor
is not cycling on and off based on thermostat feedback, but always running flat out?
Is it therefore getting too cold and thus you are running the duty cycling manually?
Or you want to get colder than 40° and it doesn't even at 100% duty cycle?
Is the unit full of contents, even if just water
The condenser / electronics
area, is it getting very hot? is ventilation there to spec?