The three usual causes on any freezer type: a failed compressor (major repair, $500 to $1,200 depending on the model), a refrigerant leak requiring sealed system repair (variable cost, requires EPA 608 certified refrigerant handling), or a failed condenser fan motor allowing the compressor to overheat and cycle off ($180 to $350). Diagnosis identifies which.
On chest freezers, secondary causes include a failed thermostat ($120 to $220 replacement) or a failed door seal allowing warm air infiltration ($150 to $280).
On upright freezers, secondary causes are the same as refrigerator freezer compartments: a failed evaporator fan, a failed defrost system leading to ice build-up on the evaporator, or a failed condenser.










