Kenmore Range Error Code 1d21

The 1d21 code means the upper oven temperature sensor is reading a resistance above 2787 ohms at the door lock checkpoint. This tells the control board that the sensor signal is outside the acceptable range. As a result, the board disables all cooking functions for the upper oven cavity until the condition is resolved.

The upper oven cooking functions are disabled by the control board when this code is active, so the upper cavity cannot be used for baking or broiling. Surface burners on a gas or electric range may still function depending on the model. It is best not to attempt to bypass the error and instead address the sensor issue before resuming normal use.

Resetting the range by cutting power at the breaker or unplugging it may temporarily clear the code from the display. However, if the underlying sensor resistance is still above 2787 ohms, the error will return as soon as the control board runs its next sensor check, usually at the start of the next cook cycle or door lock event. A reset is not a fix and the root cause must be corrected.

A knowledgeable DIYer can diagnose this fault by using a multimeter to measure the resistance of the temperature sensor directly at its connector. If the sensor reads above 2787 ohms or shows an open circuit, replacing it is a straightforward repair involving removing a few mounting screws and unplugging the harness. Wiring inspection requires careful attention along the full harness run inside the oven cavity.

If the repair requires only a new upper oven temperature sensor, parts typically cost between $20 and $60 depending on the specific model. If professional installation is needed, total repair costs including labor generally fall in the range of $100 to $200. A control board replacement, if ultimately required, can push costs higher, typically $150 to $350 for parts alone.