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Several things cause a refrigerator to stop cooling altogether or perform poorly:
. Dust-clogged condenser (air-cooled condensers require periodic cleaning)
. Stuck/faulty fan motor (either condenser or evaporator)
. Iced-up evaporator (the coil inside the fridge)
. Bad light switch that causes lights to remain on with the door closed
. Bad fan switch that prevents the fan from turning on when the door is closed
. Door not closing all the way
. Insufficient refrigerant gas (usually due to a leak in the plumbing)
. Poor air circulation inside, possibly due to improper product loading (e.g., packages blocking air vents)
. Unusually high room temperature, causing the fridge to run all the time without being able to keep up with the heat load
. Plugged refrigerant tubing (especially a blockage in the very thin capillary tube)
. Faulty compressor overload or relay, either of which can prevent the compressor from starting
. Faulty compressor (this is usually the most expensive single part to replace on a fridge)
Most of the above apply equally to refrigerators, combination refrigerator/freezers, freezers and wine chillers.