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 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 certified Thermador technicians carry genuine OEM parts and serve all 50 states with a 30-day labor warranty.
