Sub-Zero Refrigerators Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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EC20
Refrigerator displays EC20 or Service light with EC20 in diagnostics; unit may continue to cool but may also show intermittent warm temperatures.
High-Pressure Refrigeration System Fault
EC24
Refrigerator or freezer displays EC24; unit may not defrost properly, with ice buildup on evaporator and warm temperatures.
Defrost System Failure
EC30
Refrigerator displays EC30; ice production may stop and water may not dispense correctly.
Ice Maker or Ice System Fault
EC40
Refrigerator displays EC40; unit may run continuously or not maintain set temperatures.
Evaporator Fan or Air Circulation Fault
EC50
Refrigerator displays EC50; temperatures may be erratic or not matching the setpoint.
Thermistor / Temperature Sensor Fault
EC60
Refrigerator displays EC60; may be associated with high temperature alarms or compressor not running as expected.
Compressor or Inverter Control Fault
EC70
Refrigerator displays EC70; may be accompanied by door alarm issues or interior lights not behaving correctly.
Door Switch or Door Sensor Fault
EC80
Refrigerator displays EC80; may be associated with condenser over‑temperature or safety shutdowns.
Condenser Overheat / Airflow Fault
EC90
Refrigerator displays EC90; may indicate communication issues between user interface and main control board.
Control Board Communication Fault
SERVICE
The word “SERVICE” or a service wrench icon appears on the Sub‑Zero refrigerator display; unit may still cool but indicates a stored fault.
General Service Indicator / Stored Error Code
Symptom
Both refrigerator and freezer are warm; unit not cooling at all, interior lights still work.
Compressor Not Running
Symptom
Burning or electrical smell coming from the refrigerator, with or without visible smoke.
Overheating Electrical Component
Symptom
Clicking noise every few minutes, compressor attempts to start but shuts off quickly; unit not cooling.
Compressor Hard Start / Overload Tripping
Symptom
Condensation or moisture forming on the inside of glass doors or on interior walls.
High Humidity / Door Seal Issue
Symptom
Display is lit but unresponsive; buttons do not change settings or respond intermittently.
User Interface Keypad Failure
Symptom
Door alarm sounds even when doors appear closed; alarm cannot be silenced for long.
Door Ajar Detection Fault
Symptom
Exterior cabinet sides or mullion strip between doors feel excessively hot to the touch.
Condenser Heat Dissipation / Mullion Heater Overrun
Symptom
Food in refrigerator dries out quickly; produce wilts despite being in crisper drawers.
Low Humidity in Fresh Food Compartment
Symptom
Freezer cold but refrigerator and ice maker both warm; ice production has stopped.
Freezer Evaporator Frost Block / Airflow Loss
Symptom
Freezer temperature fluctuates; ice cream soft, then hard; compressor cycles seem irregular.
Freezer Thermistor or Control Regulation Issue
Symptom
High‑pitched squealing or chirping noise when doors are opened or closed.
Door Hinge or Gasket Friction
Symptom
Ice cubes are hollow, small, or cloudy; ice production is slow.
Low Water Flow to Ice Maker
Symptom
Ice maker not making ice, but water dispenser works normally.
Ice Maker Fill or Harvest Failure
Symptom
Ice maker overflows or leaks water into the freezer compartment.
Ice Maker Overfill / Valve Sticking
Symptom
Interior lights stay on after door is closed, causing heat and possible melting near light housing.
Door Switch or Light Circuit Failure
Symptom
Loud rattling or knocking noise from inside the refrigerator compartment, especially when the fan runs.
Evaporator Fan or Loose Components
Symptom
No water from dispenser; ice maker also not filling on Sub‑Zero refrigerator with dispenser.
Water Supply or Inlet Valve Failure
Symptom
Refrigerator and/or freezer temperatures are too warm; unit runs but cannot reach setpoint.
General Poor Cooling / Capacity Loss
Symptom
Refrigerator does not power on at all; display is blank and no lights or fans run.
No Power / Control Board or Supply Failure
Symptom
Refrigerator emits a strong musty or moldy odor inside.
Interior Contamination / Drain Biofilm
Symptom
Refrigerator makes loud buzzing or humming noise from the back or bottom.
Condenser Fan or Compressor Noise
Symptom
Refrigerator or freezer compartment has heavy frost on walls, ceiling, or food items.
Excess Moisture Infiltration / Frosting
Symptom
Refrigerator runs constantly and is too cold; food freezing in fresh food section.
Temperature Control or Thermistor Misreading
Symptom
Refrigerator section warm while freezer is cold; fresh food compartment not reaching set temperature.
Air Damper or Refrigerator Evaporator Airflow Restriction
Symptom
Refrigerator vibrates excessively or rattles against cabinetry when compressor runs.
Installation / Leveling Vibration Issue
Symptom
Water leaking from the front or bottom of the Sub‑Zero refrigerator onto the floor.
Defrost Drain or Drain Pan Leak
Symptom
Water leaking inside the refrigerator compartment, pooling under crisper drawers.
Clogged Refrigerator Evaporator Drain
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| EC20 |
Refrigerator displays EC20 or Service light with EC20 in diagnostics; unit may continue to cool but may also show intermittent warm temperatures.
|
High-Pressure Refrigeration System Fault | View Details |
| EC24 |
Refrigerator or freezer displays EC24; unit may not defrost properly, with ice buildup on evaporator and warm temperatures.
|
Defrost System Failure | View Details |
| EC30 |
Refrigerator displays EC30; ice production may stop and water may not dispense correctly.
|
Ice Maker or Ice System Fault | View Details |
| EC40 |
Refrigerator displays EC40; unit may run continuously or not maintain set temperatures.
|
Evaporator Fan or Air Circulation Fault | View Details |
| EC50 |
Refrigerator displays EC50; temperatures may be erratic or not matching the setpoint.
|
Thermistor / Temperature Sensor Fault | View Details |
| EC60 |
Refrigerator displays EC60; may be associated with high temperature alarms or compressor not running as expected.
|
Compressor or Inverter Control Fault | View Details |
| EC70 |
Refrigerator displays EC70; may be accompanied by door alarm issues or interior lights not behaving correctly.
|
Door Switch or Door Sensor Fault | View Details |
| EC80 |
Refrigerator displays EC80; may be associated with condenser over‑temperature or safety shutdowns.
|
Condenser Overheat / Airflow Fault | View Details |
| EC90 |
Refrigerator displays EC90; may indicate communication issues between user interface and main control board.
|
Control Board Communication Fault | View Details |
| SERVICE |
The word “SERVICE” or a service wrench icon appears on the Sub‑Zero refrigerator display; unit may still cool but indicates a stored fault.
|
General Service Indicator / Stored Error Code | View Details |
| – |
Both refrigerator and freezer are warm; unit not cooling at all, interior lights still work.
|
Compressor Not Running | View Details |
| – |
Burning or electrical smell coming from the refrigerator, with or without visible smoke.
|
Overheating Electrical Component | View Details |
| – |
Clicking noise every few minutes, compressor attempts to start but shuts off quickly; unit not cooling.
|
Compressor Hard Start / Overload Tripping | View Details |
| – |
Condensation or moisture forming on the inside of glass doors or on interior walls.
|
High Humidity / Door Seal Issue | View Details |
| – |
Display is lit but unresponsive; buttons do not change settings or respond intermittently.
|
User Interface Keypad Failure | View Details |
| – |
Door alarm sounds even when doors appear closed; alarm cannot be silenced for long.
|
Door Ajar Detection Fault | View Details |
| – |
Exterior cabinet sides or mullion strip between doors feel excessively hot to the touch.
|
Condenser Heat Dissipation / Mullion Heater Overrun | View Details |
| – |
Food in refrigerator dries out quickly; produce wilts despite being in crisper drawers.
|
Low Humidity in Fresh Food Compartment | View Details |
| – |
Freezer cold but refrigerator and ice maker both warm; ice production has stopped.
|
Freezer Evaporator Frost Block / Airflow Loss | View Details |
| – |
Freezer temperature fluctuates; ice cream soft, then hard; compressor cycles seem irregular.
|
Freezer Thermistor or Control Regulation Issue | View Details |
| – |
High‑pitched squealing or chirping noise when doors are opened or closed.
|
Door Hinge or Gasket Friction | View Details |
| – |
Ice cubes are hollow, small, or cloudy; ice production is slow.
|
Low Water Flow to Ice Maker | View Details |
| – |
Ice maker not making ice, but water dispenser works normally.
|
Ice Maker Fill or Harvest Failure | View Details |
| – |
Ice maker overflows or leaks water into the freezer compartment.
|
Ice Maker Overfill / Valve Sticking | View Details |
| – |
Interior lights stay on after door is closed, causing heat and possible melting near light housing.
|
Door Switch or Light Circuit Failure | View Details |
| – |
Loud rattling or knocking noise from inside the refrigerator compartment, especially when the fan runs.
|
Evaporator Fan or Loose Components | View Details |
| – |
No water from dispenser; ice maker also not filling on Sub‑Zero refrigerator with dispenser.
|
Water Supply or Inlet Valve Failure | View Details |
| – |
Refrigerator and/or freezer temperatures are too warm; unit runs but cannot reach setpoint.
|
General Poor Cooling / Capacity Loss | View Details |
| – |
Refrigerator does not power on at all; display is blank and no lights or fans run.
|
No Power / Control Board or Supply Failure | View Details |
| – |
Refrigerator emits a strong musty or moldy odor inside.
|
Interior Contamination / Drain Biofilm | View Details |
| – |
Refrigerator makes loud buzzing or humming noise from the back or bottom.
|
Condenser Fan or Compressor Noise | View Details |
| – |
Refrigerator or freezer compartment has heavy frost on walls, ceiling, or food items.
|
Excess Moisture Infiltration / Frosting | View Details |
| – |
Refrigerator runs constantly and is too cold; food freezing in fresh food section.
|
Temperature Control or Thermistor Misreading | View Details |
| – |
Refrigerator section warm while freezer is cold; fresh food compartment not reaching set temperature.
|
Air Damper or Refrigerator Evaporator Airflow Restriction | View Details |
| – |
Refrigerator vibrates excessively or rattles against cabinetry when compressor runs.
|
Installation / Leveling Vibration Issue | View Details |
| – |
Water leaking from the front or bottom of the Sub‑Zero refrigerator onto the floor.
|
Defrost Drain or Drain Pan Leak | View Details |
| – |
Water leaking inside the refrigerator compartment, pooling under crisper drawers.
|
Clogged Refrigerator Evaporator Drain | View Details |
No matching codes found
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