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Thank you for your inquiry! The E4 error code on the Insignia™ 130-Can Beverage Cooler typically indicates a defrost sensor malfunction. This sensor is responsible for monitoring frost buildup and regulating the defrost cycle. When the cooler displays this error, it usually means the sensor is either not functioning correctly or is not being detected by the system. To troubleshoot, you can try unplugging the unit for a few minutes and then plugging it back in to reset the system. If the error persists, inspect the cooler for any visible frost buildup or obstructions near the sensor area, which is often located near the evaporator. Keith | Insignia Support
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