Compressor Check: The black dome at the very bottom pumps the refrigerant fluid. If the fridge has power but makes no humming sound, or makes a clicking noise every few minutes without starting, the start relay or compressor itself may have failed.Refrigerant Leaks: Look closely at the copper tube joints near the compressor for oily residue. An oily spot typically indicates a refrigerant leak, which requires a certified technician to patch and recharge the gas.Drip Pan Maintenance: The small plastic tray sitting above or next to the compressor catches defrost water. Ensure it is not cracked, overflowing, or blocked by dust, which can cause foul odors or floor leaks.