On compressor units: the same three primary causes as refrigerators. Failed compressor ($500 to $1,200), refrigerant leak requiring sealed system repair (variable cost, EPA 608 required), or failed condenser fan motor ($180 to $350).
On thermoelectric units: usually a failed Peltier element or failed cooling fan. Peltier replacement is often not economical; fan replacement runs $150 to $280.










