Sub-Zero Refrigerator Error Code 45 A 45

Error code 45 A 45 indicates that the light inside the Pure Air air purifier cartridge has burned out. The Pure Air system uses this light to neutralize odors and inhibit bacterial and mold growth inside the refrigerator. The code is a maintenance notification, not a sign of a refrigeration or electrical failure. Replacing the cartridge and resetting the timer will resolve it.

Pressing and holding the PURE AIR key for 5 seconds will reset the timer and may clear the display, but it will not restore function if the cartridge light has actually burned out. The air purifier will not operate effectively without a functioning cartridge. The correct fix is to replace the cartridge first and then perform the reset.

The repair involves replacing the air purifier cartridge, which is a user-serviceable part. Cartridge prices typically range from $30 to $80 depending on the source and model compatibility. If a technician is called to perform the replacement and reset, expect additional labor costs in the range of $75 to $150 depending on your location and service provider.

Replace the air purifier cartridge with a compatible replacement unit. After the new cartridge is installed, press and hold the PURE AIR key on the control panel for 5 seconds to reset the internal service timer. The code should clear once the reset is completed successfully. Skipping the reset step will cause the code to remain on the display even with a new cartridge in place.

This code does not indicate a safety hazard. The refrigerator will continue to cool and operate normally while this code is present. The only function affected is the Pure Air purification system, which means odors and airborne contaminants inside the compartment will not be actively controlled until the cartridge is replaced.