Jenn-Air Range Error Code 1d21

The 1d21 code on a Jenn-Air range indicates a locked runaway temperature condition. It is triggered when the oven temperature exceeds 950°F while the door latch is in the locked position, most commonly during a self-clean cycle. The oven shuts down as a safety measure to prevent further overheating or damage.

A power reset may clear the code temporarily, but if the component causing the overheating has not been repaired, the fault is likely to return, possibly during the next self-clean cycle. Clearing the code without addressing the root cause does not make the oven safe to operate. A proper diagnosis of the temperature sensor, control board, and heating elements is recommended before resuming use.

Repair costs depend on which component has failed. A replacement oven temperature sensor typically falls in the range of $20 to $60 for the part, while a control board replacement can range from $150 to $350 or more. Door latch assemblies generally fall in the $50 to $120 range. Adding professional labor costs, total repair expenses can range from roughly $100 to $500 or higher depending on the diagnosis and your location.

You should not use the oven until the underlying cause of the overheating has been diagnosed and repaired. A runaway temperature condition indicates a failure in the temperature regulation system, which can pose a fire risk or cause serious damage to internal components if the oven is operated again before the fault is resolved.

Start by testing the oven temperature sensor for correct resistance readings and inspect the bake and broil elements for visible damage. Check the door latch assembly to confirm it operates and reports position correctly. If the sensor and elements test acceptable, the electronic oven control board, particularly its relay contacts, is the next component to evaluate. Depending on the failed part, repairs typically involve replacing the sensor, an element, the latch assembly, or the control board.