Sub-Zero Ice Maker Error Codes

Complete Sub-Zero Ice Maker Guide

This guide explains all Sub-Zero Ice Maker error codes (CH series) with simple troubleshooting steps to help you identify and fix common issues safely before calling a technician.

EC10
Ice Maker Motor Jam
  • Turn off unit immediately.
  • Check for ice blockage in motor assembly.
  • Manually rotate mechanism to test movement.
  • Inspect gears for wear or damage.
  • Replace motor assembly if jam persists.
EC11
Ice Tray Not Detected
  • Ensure ice tray is properly installed.
  • Check tray alignment with detection sensor.
  • Remove ice buildup around sensor area.
  • Inspect sensor wiring for loose connection.
  • Replace sensor module if issue continues.
EC12
Water Fill Error
  • Check water supply valve is fully open.
  • Inspect inlet hose for kinks or blockage.
  • Clean inlet filter screen.
  • Verify household water pressure is stable.
  • Replace inlet valve if no water flow detected.
EC16
Low Water Pressure Warning
  • Check main water line pressure.
  • Inspect filters for clogging.
  • Ensure supply line is not frozen or blocked.
  • Flush water line to restore flow.
EC13
Harvest Cycle Failure
  • Check ice formation in mold.
  • Inspect ejector motor operation.
  • Ensure freezer temperature is sufficiently low.
  • Remove ice obstruction in mechanism.
  • Replace drive motor if failure continues.
EC17
Ice Overproduction Fault
  • Check bin sensor for proper detection.
  • Ensure ice bin is correctly installed.
  • Inspect sensor alignment.
  • Reset system to recalibrate ice level detection.
EC14
Sensor Calibration Fault
  • Power cycle the ice maker.
  • Check temperature and position sensors.
  • Inspect wiring for loose connections.
  • Remove ice buildup around sensors.
  • Replace sensor module if readings remain incorrect.
EC18
Temperature Sensor Failure
  • Verify freezer temperature stability.
  • Check sensor placement and connection.
  • Clean dust or frost around sensor area.
  • Replace temperature sensor if faulty.
EC15
Ice Bin Full Sensor Error
  • Remove ice bin and reinstall properly.
  • Clean sensor area from frost buildup.
  • Check sensor alignment and wiring.
  • Ensure bin is not overfilled or blocked.
  • Replace sensor if continuously malfunctioning.
EC19
Ice Bin Jam Detected
  • Remove ice bin completely.
  • Break up and remove frozen blockages.
  • Check chute for ice buildup.
  • Reinstall bin and restart system.
EC20
Control Board Communication Error
  • Turn off ice maker and reboot system.
  • Inspect main board connections.
  • Check for moisture or corrosion.
  • Replace control board if issue persists.
EC21
Power Supply Instability
  • Check outlet voltage stability.
  • Inspect power cord and plug.
  • Reset breaker if necessary.
  • Use dedicated power source for unit.

Frequently Asked Questions


Why does my Sub-Zero Ice Maker show system error or ERR messages?
ERR messages on Sub-Zero Ice Makers usually indicate water supply faults, ice production errors, sensor malfunctions, motor jams, temperature issues, or control board communication failures. Turn off the unit, wait a few minutes, then restart. Check water line, filter condition, ice bin alignment, and freezer temperature stability.
Why does my Sub-Zero Ice Maker stop making ice?
This is often caused by blocked water supply, low water pressure, frozen inlet line, dirty filters, or faulty sensors. Inspect water flow, clean or replace filters, and ensure the freezer maintains proper temperature.
Why does my Sub-Zero Ice Maker not turn on?
Check power outlet, circuit breaker, wiring connection, and internal switch. Ensure stable voltage supply and perform a reset by unplugging the unit for 5–10 minutes before restarting.
Why does my Sub-Zero Ice Maker produce small or misshaped ice cubes?
This may be caused by low water pressure, clogged inlet filter, partial freezing issues, or incorrect temperature settings. Check water supply, clean filters, and verify freezer temperature is properly set.
Why does my Sub-Zero Ice Maker leak water?
Leaks are usually caused by loose water connections, damaged tubing, clogged drain lines, or ice overflow melting inside the unit. Inspect all connections and ensure proper installation and leveling.
Why does my Sub-Zero Ice Maker make unusual noises?
Unusual noises may come from ice jams, motor strain, ejector mechanism issues, or water valve vibration. Turn off the unit and check for ice blockages or loose internal parts.
Why does my Sub-Zero Ice Maker not detect ice bin or tray?
This can be caused by misaligned ice bin, dirty sensors, or faulty detection switch. Remove and reinstall the bin properly and clean sensor areas.
Why does my Sub-Zero Ice Maker stop producing ice mid-cycle?
This is often caused by temperature instability, motor overload protection, frozen components, or sensor errors. Allow the unit to thaw slightly, then restart and check airflow and cooling conditions.
Why does my Sub-Zero Ice Maker show poor ice production?
Poor ice production may result from dirty condenser coils, restricted airflow, clogged water lines, or weak water pressure. Clean coils, check ventilation, and ensure proper water flow.
How do I reset my Sub-Zero Ice Maker system errors?
Turn off the unit or unplug it for 5–10 minutes. Restore power and allow the system to recalibrate. This clears temporary errors and resets internal controls.
When should I service my Sub-Zero Ice Maker?
Service is recommended if ice production fails repeatedly, motor jams persist, water flow is blocked, or system errors continue after troubleshooting steps.
Important: Sub-Zero Ice Maker system messages are designed to protect internal components such as the water inlet system, motor assembly, sensors, thermostat, and control board. If problems continue after troubleshooting, stop using the unit and contact an authorized Sub-Zero service technician.