KitchenAid Refrigerator Error Code E1 — Defrost System Failure
What this means
The E1 error code on KitchenAid refrigerators indicates a defrost system failure. The defrost heater, defrost thermostat (bimetal), or defrost timer/control has failed, causing frost and ice to build up on the evaporator coils. Over time, this blocks airflow and causes the refrigerator and freezer compartments to warm up.
Step-by-step fix
5 stepsCheck for heavy ice buildup
Open the freezer and check the back wall. If there's heavy frost or ice buildup, the defrost system has been failing for some time.
If the freezer is iced up but the fresh food section is warm, that confirms the evaporator coils are blocked by ice.
Manual defrost
Unplug the refrigerator. Remove food to coolers. Leave the doors open and let the ice melt (or use a hair dryer on low heat to speed it up). This can take several hours.
Place towels on the floor to absorb melt water.
Test the defrost heater
Once the ice is gone, access the evaporator cover in the freezer. Test the defrost heater for continuity with a multimeter. If there's no continuity, the heater has burned out.
Test the defrost thermostat
Test the defrost thermostat (bimetal) for continuity at room temperature. It should show continuity when cold and open when warm.
Replace the faulty component
Replace the defrost heater if it tests open, or the thermostat if it doesn't change state properly. Reassemble and plug the refrigerator back in.
When to call a professional
If the heater and thermostat test good but defrost still doesn't work, the defrost control board (ADC) may need replacement.
Related error codes
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
Learn more about our sourcesParts you may need
Links may earn us a commission at no extra cost to you. We only recommend parts relevant to this repair.