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; this may be associated with condenser over-temperature or safety shutdowns.
Condenser Overheat / Airflow Fault
EC90
Refrigerator displays EC90; this may indicate communication issues between the user interface and the main control board.
Control Board Communication Fault
SERVICE
The word “SERVICE” or a service wrench icon appears on the Sub-Zero refrigerator display; the unit may still be cooling but this indicates a stored fault.
General Service Indicator / Stored Error Code
Symptom
A clicking noise occurs every few minutes, the compressor attempts to start but shuts off quickly; the unit is not cooling.
Compressor Hard Start / Overload Tripping
Symptom
A high-pitched squealing or chirping noise occurs when the doors are opened or closed.
Door Hinge or Gasket Friction
Symptom
A loud rattling or knocking noise is coming from inside the refrigerator compartment, especially when the fan is running.
Evaporator Fan or Loose Components
Symptom
Both the refrigerator and freezer are warm; the unit is not cooling at all, but the 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
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
Ice cubes are hollow, small, or cloudy; ice production is slow.
Low Water Flow to Ice Maker
Symptom
Interior lights stay on after door is closed, causing heat and possible melting near light housing.
Door Switch or Light Circuit Failure
Symptom
No water from the dispenser; the ice maker is also not filling on a Sub-Zero refrigerator with a dispenser.
Water Supply or Inlet Valve Failure
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 vibrates excessively or rattles against cabinetry when compressor runs.
Installation / Leveling Vibration Issue
Symptom
The freezer is cold, but the refrigerator and ice maker are both warm; ice production has stopped.
Freezer Evaporator Frost Block / Airflow Loss
Symptom
The freezer temperature fluctuates; ice cream becomes soft, then hard again; compressor cycles seem irregular.
Freezer Thermistor or Control Regulation Issue
Symptom
The ice maker is not making ice, but the water dispenser works normally.
Ice Maker Fill or Harvest Failure
Symptom
The ice maker overflows or leaks water into the freezer compartment.
Ice Maker Overfill / Sticking Valve
Symptom
The refrigerator and/or freezer temperatures are too warm; the unit runs but cannot reach the setpoint.
General Poor Cooling / Capacity Loss
Symptom
The refrigerator is making a loud buzzing or humming noise from the back or bottom.
Condenser Fan or Compressor Noise
Symptom
The refrigerator or freezer compartment has heavy frost on the walls, ceiling, or food items.
Excess Moisture Infiltration / Frosting
Symptom
The refrigerator runs constantly and is too cold; food is freezing in the fresh food section.
Temperature Control or Thermistor Misreading
Symptom
The refrigerator section is warm while the freezer is cold; the fresh food compartment is not reaching its set temperature.
Air Damper or Refrigerator Evaporator Airflow Restriction
Symptom
Water is leaking from the front or bottom of the Sub-Zero refrigerator onto the floor.
Defrost Drain or Drain Pan Leak
Symptom
Water is leaking inside the refrigerator compartment, pooling under the 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; this may be associated with condenser over-temperature or safety shutdowns.
|
Condenser Overheat / Airflow Fault | View Details |
| EC90 |
Refrigerator displays EC90; this may indicate communication issues between the user interface and the 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; the unit may still be cooling but this indicates a stored fault.
|
General Service Indicator / Stored Error Code | View Details |
| – |
A clicking noise occurs every few minutes, the compressor attempts to start but shuts off quickly; the unit is not cooling.
|
Compressor Hard Start / Overload Tripping | View Details |
| – |
A high-pitched squealing or chirping noise occurs when the doors are opened or closed.
|
Door Hinge or Gasket Friction | View Details |
| – |
A loud rattling or knocking noise is coming from inside the refrigerator compartment, especially when the fan is running.
|
Evaporator Fan or Loose Components | View Details |
| – |
Both the refrigerator and freezer are warm; the unit is not cooling at all, but the 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 |
| – |
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 |
| – |
Ice cubes are hollow, small, or cloudy; ice production is slow.
|
Low Water Flow to Ice Maker | 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 |
| – |
No water from the dispenser; the ice maker is also not filling on a Sub-Zero refrigerator with a dispenser.
|
Water Supply or Inlet Valve Failure | 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 vibrates excessively or rattles against cabinetry when compressor runs.
|
Installation / Leveling Vibration Issue | View Details |
| – |
The freezer is cold, but the refrigerator and ice maker are both warm; ice production has stopped.
|
Freezer Evaporator Frost Block / Airflow Loss | View Details |
| – |
The freezer temperature fluctuates; ice cream becomes soft, then hard again; compressor cycles seem irregular.
|
Freezer Thermistor or Control Regulation Issue | View Details |
| – |
The ice maker is not making ice, but the water dispenser works normally.
|
Ice Maker Fill or Harvest Failure | View Details |
| – |
The ice maker overflows or leaks water into the freezer compartment.
|
Ice Maker Overfill / Sticking Valve | View Details |
| – |
The refrigerator and/or freezer temperatures are too warm; the unit runs but cannot reach the setpoint.
|
General Poor Cooling / Capacity Loss | View Details |
| – |
The refrigerator is making a loud buzzing or humming noise from the back or bottom.
|
Condenser Fan or Compressor Noise | View Details |
| – |
The refrigerator or freezer compartment has heavy frost on the walls, ceiling, or food items.
|
Excess Moisture Infiltration / Frosting | View Details |
| – |
The refrigerator runs constantly and is too cold; food is freezing in the fresh food section.
|
Temperature Control or Thermistor Misreading | View Details |
| – |
The refrigerator section is warm while the freezer is cold; the fresh food compartment is not reaching its set temperature.
|
Air Damper or Refrigerator Evaporator Airflow Restriction | View Details |
| – |
Water is leaking from the front or bottom of the Sub-Zero refrigerator onto the floor.
|
Defrost Drain or Drain Pan Leak | View Details |
| – |
Water is leaking inside the refrigerator compartment, pooling under the crisper drawers.
|
Clogged Refrigerator Evaporator Drain | View Details |
No matching codes found
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