Maytag Range Error Code 1d21

Code 1d21 means the control board detected a runaway temperature of 950°F or higher in the upper or single oven cavity while the door was locked. This is a safety fault designed to stop an uncontrolled heating event. It most commonly occurs during or after a self-clean cycle, where both high heat and the door lock are active simultaneously.

Start by disconnecting power to the range for at least 5 minutes to reset the control board. Once power is restored, check the oven temperature sensor resistance. It should read around 1080 ohms at room temperature using a multimeter. If the sensor reads open, shorted, or significantly out of range, replace it. If the sensor tests good, inspect the control board for relay contacts that have welded shut; a board with stuck relays requires replacement. Also examine the sensor wiring harness for heat damage or shorts near the oven cavity.

Self-clean cycles run at extreme temperatures, typically between 800°F and 900°F, which pushes components close to their limits. The 1d21 code appears when the oven exceeds 950°F during this process, which can happen if the temperature sensor has drifted and is reading low (causing the board to add more heat than needed), or if relay contacts on the control board have welded shut from repeated high-heat cycling. The door-locked condition referenced in this code is consistent with the self-clean door latch being engaged. After the oven cools and power is reset, test the sensor before running another self-clean cycle.

No, you should not use the oven until the cause of the 1d21 code has been diagnosed and resolved. A runaway temperature condition at 950°F indicates either a stuck relay keeping the heating element on or a sensor feeding bad data to the control board. Both of which can cause the oven to overheat again. Disconnect power, allow the oven to cool completely, and inspect the sensor and relay contacts before resuming use.

Repair cost depends on the failed component. An oven temperature sensor (RTD) typically costs $20 to $60 for the part, and replacing it is a manageable DIY repair requiring only a screwdriver. A control board replacement is more expensive, ranging from $150 to $350 for the part depending on the model, with professional labor adding $100 to $200. Diagnose the sensor first since it is the simpler and cheaper fix; if the board relays are the problem, weigh repair cost against the age of the appliance.