Thermador Oven Error Code E4

E4 on a Thermador oven with the earlier Dreefs control system means the oven temperature sensor is not functioning. The control board cannot receive a valid signal from the sensor, so it shuts down oven operation entirely. The oven will not heat until the fault is resolved.

No. The E4 code causes the oven to disable heating functions, so the oven will not operate. Even if you could bypass the lockout, running the oven without a functioning temperature sensor would mean no temperature regulation, creating a fire and safety hazard. Do not attempt to bypass this fault.

If only the temperature sensor needs replacement, parts and labor typically range from around $100 to $250 depending on your location and service provider. If the wiring harness or Dreefs control board requires replacement, costs can range from $200 to $500 or more. Getting a diagnostic visit from a technician first can help clarify which component is at fault before committing to parts.

A knowledgeable DIYer can test the temperature sensor with a multimeter and replace it if it reads as open or shorted. The sensor is typically accessed inside the oven cavity and secured with one or two screws. However, if the wiring harness or control board is involved, a qualified technician is recommended for those repairs.

Resetting the oven by cutting power at the breaker may temporarily clear the code, but E4 will return as soon as the control board attempts to read the sensor again and finds the same fault. A reset does not repair the underlying sensor or wiring problem.