Thermador Oven Error Code E218

E218 indicates a cooling fan supervision error in the lower oven cavity (Cvt 2). The control board has detected that the cooling fan speed is either too low or too high compared to the expected operating range. This error is monitored via a Hall Effect Sensor that tracks fan rotation speed and reports it back to the control board.

It is not recommended to continue using the oven while E218 is active. The cooling fan in the lower cavity protects internal electronics and surrounding components from excessive heat buildup. Operating the oven without a properly functioning cooling fan risks damage to control boards and other heat-sensitive parts.

Repair costs vary depending on the root cause. If the fix involves reseating a connector or repositioning the harness or plenum, the cost may only be a service call fee, typically in the range of $80 to $150. If a Hall Effect Sensor or cooling fan motor needs replacement, parts plus labor can bring the total to a range of $200 to $500 or more, depending on parts availability and your location.

Some causes of E218 are accessible to a knowledgeable DIYer. Checking the Hall Effect Sensor connector, inspecting the wire harness for pinching or contact with the motor, and verifying that the plenum is not touching the fan end cap are all diagnostic steps that do not require replacing parts. If these checks do not resolve the fault, testing or replacing the sensor or fan motor will likely require a qualified technician.

A power reset may temporarily clear the E218 code, but if the underlying fault, such as a loose sensor connection, pinched harness, or failing fan motor, has not been addressed, the error will return during operation. A reset is only useful as a step to confirm whether the fault is persistent or intermittent, not as a repair in itself.