Display shows H1 or "HI" and the interior temperature is very warm; unit may be in alarm mode.

Note: H1/HI is usually an alarm, not a sensor failure code.

Steps to resolve:

• Check door seal: Ensure the door is fully closing and the gasket is not warped or torn. Remove any bottles preventing full closure.
• Verify ventilation: Koolatron wine coolers require several inches of clearance at the back and sides. Move the unit away from walls and do not enclose it in a tight cabinet.
• Inspect fans: With the unit plugged in and running, listen for the internal and rear fans. If a fan is not spinning, unplug the unit and check for obstructions or seized bearings. Replace the evaporator fan motor or rear cooling fan if defective.
• Check ambient temperature: Thermoelectric models struggle in very hot rooms (above ~25–27°C / 77–80°F). Move the cooler to a cooler location if necessary.
• Cooling system check: If fans run and ventilation is good but the unit does not cool, the Peltier module or compressor system may have failed and require replacement by a technician.