KitchenAid Range Code 1d21: Sensor, control or wiring check

What 1d21 means

Displayed as 1d21, this KitchenAid range code warns of a possible problem with the oven temperature sensor, the control, or the associated wiring. The 1d2 pair, 1d21 and 1d22, belongs with the 1d1 pair under the same message, and no model is named. Look for an oven that struggles to hold temperature, or one that will not preheat at all.

Common causes of 1d21

Temperature sensor reading outside its range
Oven control reading the signal
Wiring to the sensor

✓ One safe check you can try

1. Switch the oven off. 2. Wait until it is cool to the touch. 3. Remove loose foil or pans that may touch the sensor. 4. Cycle the breaker off for a minute and on again. 5. Try a brief bake; if 1d21 returns, call us.

! Why to stop there

Three parts share the message, so only testing identifies the right one.
Wiring problems can mimic a bad sensor.
We quote in writing first and give 30 days of workmanship warranty.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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1d211d21 questions

How do I know whether it is the sensor or the control?

You cannot tell from outside. A technician measures the sensor and then checks the control and the wiring to find which of the three needs repair.

Can foil cause 1d21?

Foil lining the oven bottom can disturb heat and sometimes touches parts it should not. Remove it, but a code that persists still needs proper testing.

Is a reset enough?

Only if the code does not come back. If it returns after a one-minute breaker reset, a hands-on check is needed and we will quote it in writing first.