Sub-Zero Ice Maker Error Code REPLACE FILTER

The REPLACE FILTER alert with a red indicator light means the ice maker's internal cycle counter has reached 8000 freeze and harvest cycles. This is a scheduled maintenance reminder tied to filter service life, not a component failure. The unit is signaling that the water filter should be replaced to maintain ice quality and protect internal water-side components. After replacing the filter, hold the CLEAN button for 6 seconds to reset the counter and clear the light.

The unit will continue to make ice with the alert active, but operating with an exhausted filter means contaminants, sediment, and scale are no longer being adequately removed from the water supply. Over time this can affect ice taste and odor, and scale accumulation can impact water valve and mold performance. Replacing the filter promptly is recommended to avoid these issues.

Holding the CLEAN button for 6 seconds will reset the counter and turn off the red light regardless of whether the filter was replaced, but this does not address the actual condition of the filter media. A filter that has processed 8000 cycles is considered spent, and skipping the replacement means the water supply to the ice maker is no longer being properly filtered. The reset should always follow an actual filter change, not substitute for one.

Install a new compatible water filter in the unit, then press and hold the CLEAN button for 6 seconds to reset the internal cycle counter. The red indicator light should extinguish once the reset is accepted. If the light remains on after the reset attempt, confirm the button was held for the full 6 seconds and try the sequence again.

Replacement water filters for Sub-Zero ice makers typically range from around $40 to $80 depending on the specific model and where the filter is purchased. If a technician is handling the replacement and reset procedure, expect an additional service call fee on top of the part cost.