Sub-Zero Ice Maker Error Code Clean Light Flashing

A flashing Clean light on a Sub-Zero ice maker signals that the electronic control board has detected a short or open circuit in the thermistor circuit. The thermistor is a temperature-sensing component that the control board relies on to monitor bin conditions. The machine will not operate normally until the fault is identified and corrected. The issue can stem from a loose connector, a failed thermistor, or in less common cases, the control board itself.

The ice maker will typically halt or limit normal production when this fault is active because the control board cannot confirm bin temperature or ice level. Continuing to use ice already in the bin is safe, but the machine should not be relied upon for consistent ice production until the thermistor circuit fault is resolved. There is no immediate safety hazard to the household from this fault code.

A reset may temporarily clear the flashing indicator, but if the underlying thermistor circuit fault still exists, the Clean light will return after the control board completes its self-check. The fault code is triggered by a measurable electrical condition, not a software glitch, so resetting without addressing the root cause is not a lasting solution. The thermistor circuit must be inspected and the defective component repaired or replaced to permanently clear the fault.

A knowledgeable DIYer can attempt the basic connector checks, which involve confirming the thermistor harness is fully plugged in and that all terminals are seated securely in their housings. If connectors look fine, testing the thermistor with a multimeter is the next step, which requires basic comfort with electrical testing. Replacing the thermistor is a straightforward repair, but if the control board is suspect, professional service is recommended to avoid unnecessary parts expense.

If the fix is simply reseating a connector, there is no parts cost involved. Replacing a faulty bin thermistor typically costs between $30 and $80 for the part, plus any applicable labor charges. If the control board requires replacement, parts alone can range from $150 to $400 or more depending on the specific model, with additional labor costs if a technician is needed.