The defrost timer will click when the automatic defrost cycle begins and ends. The thermostat control (or refrigerator control, depending on the model) will also click when cycling on and off.
Rattling noises may come from the flow of refrigerant, the water line, or items stored on top of the refrigerator.
Your refrigerator is designed to run more efficiently to keep your food items at the desired temperature. The high efficiency compressor may cause your new refrigerator to run longer than your old one, and you may hear a pulsating or 
You may hear the evaporator fan motor circulating the air through the refrigerator and freezer compartments.
As each cycle ends, you may hear a gurgling sound due to the refrigerant flowing in your refrigerator.
Contraction and expansion of the inside walls may cause a popping noise.
Water dripping on the defrost heater during a defrost cycle may cause a sizzling sound.
You may hear air being forced over the condenser by the condenser fan.
You may hear water running into the drain pan during the defrost cycle.
LRFD22850, LRFC22750 specifications
LG Electronics has consistently set the standard for innovative kitchen appliances, and their refrigerator models, the LRFC22750 and LRFD22850, showcase just how far technology has come in enhancing daily living. Both models incorporate a host of features aimed at convenience, energy efficiency, and storage flexibility, making them ideal choices for modern kitchens.The LG LRFC22750 is a top-freezer refrigerator that offers a spacious design. One of its standout features is the Smart Diagnosis technology, which simplifies troubleshooting. This allows users to connect the appliance with their smartphones for an effortless diagnosis of any issues, saving time and reducing the hassle of service calls. Additionally, this model boasts a multi-air flow cooling system that ensures even distribution of cool air, keeping food items fresher for longer. The energy-efficient design coupled with a top-tier Energy Star rating ensures that users can enjoy their food storage without breaking the bank on electricity bills.
On the other hand, the LRFD22850 is a French door refrigerator that combines innovative design with advanced functionality. Its spacious layout offers a generous interior, featuring adjustable shelves that accommodate various item sizes, making organization hassle-free. The LG Smart Pull Drawer is another highlight, allowing for easy access to snacks and beverages. This design promotes convenience while enhancing accessibility for families on the go. Further enhancing its value, the Smart Cooling Plus technology adapts to environmental changes, maintaining optimal humidity and temperature levels, which helps to preserve the freshness of fruits and vegetables.
Both models are equipped with the sophisticated Linear Compressor technology. This system minimizes fluctuations in temperature, enhancing the longevity of perishable items. The quiet operation of the compressors ensures that users can enjoy a peaceful kitchen environment without disruptive noise.
Lastly, both the LRFC22750 and LRFD22850 come with a sleek stainless steel finish, ensuring they not only perform exceptionally well but also look great in any kitchen decor. With their combination of performance, technology, and elegant design, LG's refrigerators stand out as top choices for consumers who value efficiency, style, and functionality. Whether opting for the traditional top-freezer layout or the modern French door configuration, both the LRFC22750 and LRFD22850 promise to deliver exceptional usability and satisfaction in any household.