Thermador Range Error Code Er:05

Er:05 indicates an NTC thermistor interruption in the WFR 2460 washer circuit of the range. The control board has detected an open circuit where it expects a continuous resistance signal from the NTC temperature sensor. This is caused by either a broken wire in the sensor harness or a failed NTC sensor itself. The appliance displays this code to alert the user that temperature monitoring has been lost.

It is not advisable to continue operating the range with Er:05 active. The error means the control board has lost its temperature feedback from the NTC sensor, so it cannot accurately regulate or monitor heat levels. Continued use without a functioning temperature sensor could lead to uncontrolled heating conditions. The appliance should remain off until the fault is diagnosed and repaired.

Repair costs vary depending on whether the fault is a simple connector issue or requires a new NTC sensor and harness repair. A straightforward connector reseating during a service call typically falls within the range of a standard diagnostic fee. If the NTC sensor needs replacement, parts and labor combined can range from roughly $100 to $300 or more depending on your location and the specific parts required. A technician can give a firm estimate after completing the diagnosis.

Some homeowners comfortable with basic electrical testing can inspect the wiring harness for visible damage or loose connectors and reseat any disconnected plugs. However, accurately diagnosing a failed NTC versus a wiring break requires a multimeter and knowledge of how to perform continuity and resistance tests. Replacing the NTC sensor or repairing harness wiring involves working near components that may retain heat, so if you are not confident in electrical diagnostics, a qualified technician is the safer choice.

A power reset by cycling the breaker or unplugging the range may temporarily clear the display, but the code will return if the underlying fault is still present. Because Er:05 is caused by a physical hardware problem, either a broken wire or a failed NTC sensor, no amount of resetting will resolve it. The wiring and sensor must be inspected and repaired or replaced to permanently clear the code.