Using this universal freezer thermostat is easy. First, locate a suitable spot inside your freezer to mount the thermostat using the included mounting bracket. Attach the thermostat firmly. Then, connect the capillary tube, which is 2 meters long, properly. You can adjust the temperature settings using the universal knob. When the temperature inside the freezer rises, the make on rise warning signal will be triggered, and if your freezer has a temperature warning light, it will come on. As for maintenance, keep the thermostat clean and free from dust. Check the connections periodically to ensure they are secure. If you notice any issues, don't hesitate to contact us. And remember, since we've been in the appliance parts business for over 25 years, you can rely on our quality products.