Thermador Range Error Code E:18

E:18 on a Thermador WTMC dryer indicates an NTC error specifically for the R2 temperature sensor located at the heater assembly. The control board has detected that the resistance signal from NTC R2 is outside the acceptable range. This fault causes the appliance to flag the error to prevent unsafe operating temperatures. Both the sensor and its wire harness should be inspected and tested as the first step.

Running the dryer while E:18 is active is not recommended. The NTC R2 sensor is responsible for monitoring temperatures at the heater, and if it is not functioning correctly, the control board cannot reliably regulate heat output. Continuing to operate the unit risks overheating or component damage. The appliance should remain off until the fault is diagnosed and the faulty part is replaced.

A power reset may temporarily clear the E:18 code from the display, but the error will return if the underlying fault with NTC R2 or the wire harness has not been corrected. Resetting without addressing the root cause is not a repair. The sensor and harness should be tested and any faulty components replaced before the appliance is returned to regular use.

A knowledgeable DIYer can begin by visually inspecting the wire harness and connectors for obvious damage and reseating any loose connections. Measuring the NTC R2 sensor resistance with a multimeter requires basic electrical knowledge and is within reach for experienced DIYers. However, if the sensor or harness needs replacement, and certainly if the control board is suspected, a qualified appliance technician is the safer choice.

Repair costs depend on which component has failed. An NTC temperature sensor is generally an inexpensive part, with replacement sensors typically ranging from $15 to $60 depending on the model. If the wire harness requires replacement, parts and labor could range from $80 to $200 or more. A control board replacement, if needed, is significantly more expensive, often $200 to $500 or higher including labor.