Using this Fisher & Paykel refrigerator thermostat is easy. First, make sure your refrigerator is unplugged for safety. Then, carefully remove the old thermostat and install the new one using the included mounting hardware and universal knob. Once installed, plug your refrigerator back in. During use, always keep an eye on your fridge's temperature to ensure the thermostat is working properly. As for maintenance, there's not much you need to do. But be very careful not to bend the capillary tube sharply. A sharp bend can damage the thermostat and make it stop working. With proper use and care, this thermostat will serve you well for a long time. And since we've been in the appliance parts business for over 25 years, you can trust that you've bought a reliable product.