For H2300:
Press and hold on the ‘Quantity’ button for 6 seconds. The button in the middle should be flashing a light-blue light, activating eco (energy saving) mode.
For H1675S:
Press and hold ‘Safety Lock’ button for 6 seconds to activate eco mode.
For H850, H850S, and H2200:
Activate the eco mode by turning on the switch located at the back of the machine.