E1 — Temperature sensor fault
Freezer sensor reading out of range. May cause the compressor to run continuously or not at all. Check actual temperature with a standalone thermometer. Reset power — if E1 returns, sensor needs replacement.
E2 — Defrost heater failure
Auto-defrost cycle not completing. Frost will accumulate on the evaporator. Heater, bi-metal thermostat, or defrost board needs testing as a system. Manual defrost is a temporary solution.
E3 — Compressor start failure
Critical — the freezer will warm without active cooling. Clicking sound near the compressor indicates start relay failure. Move frozen items to another freezer. Professional sealed-system diagnosis required.
E4 — Evaporator fan failure
Cold air not circulating. Compressor runs but temperature is uneven. Fan motor or ice buildup on blade. If ice is present, a concurrent defrost issue likely caused it.
E5 — Door seal alarm
Door open too long or gasket not sealing. Check for items blocking the door. Paper-slip test the gasket. For panel-ready doors, verify the custom panel hasn’t shifted.
E6 — SuperFreeze malfunction
Rapid-freeze function won’t activate or won’t time out. Standard freezing continues normally. Control board timer circuit or thermistor issue. Non-urgent repair.
Need professional Thermador Freezer service?
If troubleshooting doesn’t resolve the issue, our factory-certified Thermador technicians can help. We service all Thermador Freezer models across all 50 states with genuine OEM parts and a 30-day labor warranty. Schedule service online — same-day booking available.
Related Thermador resources
- Thermador Freezer repair service — certified technicians in all 50 states
- Thermador error code database — search all Freezer error codes
- Thermador model database — specifications and repair info by model number
- Thermador official site — official specifications, manuals, and product information
Important notes for Thermador freezer owners
- Always use genuine OEM parts — aftermarket components may fit but can compromise performance, safety, and warranty coverage on Thermador appliances
- Never ignore error codes — Thermador codes are diagnostic aids designed to prevent small issues from becoming major failures. Address them promptly
- Keep your owners manual accessible — it contains model-specific maintenance schedules and troubleshooting trees. Digital versions are available on the Thermador official site
- Document issues before calling — note error codes, symptoms, when they started, and patterns. This helps the technician diagnose faster
- Use surge protectors — power fluctuations damage electronic control boards. A quality surge protector protects your investment
When DIY troubleshooting is not enough
Some Thermador freezer issues can be resolved with the steps in this guide. However, call a certified technician immediately if you encounter:
- Gas smell (gas models) — turn off the appliance, open windows, leave the house, call from outside
- Burning smell or smoke — disconnect power immediately. Do not use until inspected
- Electrical sparking — turn off at the circuit breaker. Wiring or component failure
- Water leaking inside walls — shut off supply and call to prevent water damage
- Error codes that return after power reset — persistent codes indicate real component failure
- Sealed system issues — compressor, refrigerant work requires EPA-certified technicians
Schedule service online — our factory-certified Thermador technicians carry genuine OEM parts and serve all 50 states with a 30-day labor warranty.
