Amana Oven Error Code 21

Error code 21 on an Amana oven indicates that the RTD temperature sensor circuit is detecting a shorted condition. The control board monitors the sensor's resistance to regulate oven temperature, and a short causes an abnormal low-resistance reading. This code can also appear repeatedly if the room temperature is unusually cold, triggering a false short reading. Confirm room temperature first, then inspect the sensor and its wiring if the error continues.

It is not recommended to operate the oven while error code 21 is active. A shorted RTD sensor means the control board cannot accurately monitor the oven's internal temperature, which could lead to overheating or unreliable cooking performance. Discontinue use until the sensor circuit has been inspected and confirmed functional.

Repair costs depend on the root cause. If only the RTD temperature sensor needs replacement, parts typically range from around $20 to $60, with professional labor adding $75 to $150 or more depending on the service provider. If the control board is at fault, parts alone can range from $100 to $250 or higher, plus labor. Diagnosing the exact cause before ordering parts is strongly recommended to avoid unnecessary expenses.

In some cases, yes. If the error is triggered by a cold room, simply allowing the room to warm up may clear the fault. If the issue is a loose or corroded connector, cleaning and reseating it is a manageable DIY repair. Replacing the RTD sensor is also a relatively straightforward repair for someone comfortable working with appliances, though it does require disconnecting power and accessing the oven cavity. Control board replacement is more complex and may warrant professional service.

A reset, typically done by disconnecting power for a few minutes and restoring it, may temporarily clear the error. However, if the underlying cause is a shorted sensor, damaged wiring, or a faulty connection, the code will return once the oven attempts to operate. A reset is useful for confirming whether the fault is persistent or intermittent, but it does not repair the root problem.