What is the most common reason a fridge stops working?

The most common reason a fridge stops working is loss of cooling due to dirty condenser coils, defrost system failure, or evaporator fan failure that blocks airflow, followed by electrical issues like failed compressor start relay. Dirty condenser coils located at bottom or back of fridge accumulate dust and pet hair, causing compressor to overheat and shut down on thermal overload, so fridge stops cooling entirely until coils are cleaned. Second, defrost system failure where defrost heater, thermostat, or control board fails, causing evaporator coils to frost over completely, blocking cold air from reaching fresh food section, so fridge feels warm while freezer may still be cold. Third, evaporator fan motor failure that stops circulating cold air from freezer to fridge. Fourth, compressor start relay and overload failure, a small device on compressor that helps it start, costing 30 to 80 dollars, which clicks but compressor does not start, so fridge clicks but does not cool. Fifth, power outage or tripped breaker or GFCI outlet that cuts power. Sixth, door left ajar or door gasket failure that lets warm air in causing compressor to run continuously then overheat and shut off. Seventh, failed control board from power surge. Regular cleaning of coils every 6 to 12 months, replacing water filter, ensuring door gaskets seal, and using surge protector prevents most common failures that cause fridge to stop working.