JennAir Range Code 3d21: Oven temperature circuit warning

What 3d21 means

JennAir ranges such as the JDRP548W or JES1750FS display 3d21 when the oven temperature sensor, the control, or the wiring that links them may have a problem. The control uses that sensor to hold the set temperature, so when the reading is in doubt the oven shuts the cycle down. You will see the code and a cold or half-baked dish.

Common causes of 3d21

Oven temperature sensor failure
Oven control error in reading the sensor
Loose or damaged wire at the sensor

✓ One safe check you can try

1. Turn the oven off and let it cool. 2. Press Cancel. 3. Switch off the range's circuit breaker for a minute, then switch it on. 4. Run a short Bake as a test. 5. If 3d21 shows again, stop using the oven and call us. A slow preheat before the code is worth mentioning.

! Why to stop there

The sensor and its wire are hard to reach safely.
Skipping the diagnosis can mean paying for the wrong part.
The oven should not run unattended with a doubtful temperature reading.

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.

→Same appliance

Other Range codes

Indicator FlashingJennAir Range Cooktop Indicator Flashing: Keys Pressed or Controls Set Wrong Indicator or Hot Light OnJennAir Range Hot Light On: A Control or Element Is Still Hot Lo or PreJennAir Range Display "Lo" or "Pre": The Oven Is Warming Up LockJennAir Range Cooktop Control Lock: Unlock to Use the Surface Locked, Lock or LocJennAir Range Oven Display "Locked", "Lock" or "Loc": Unlock Controls and Door Press Cancel to ResetJennAir Range Message "Press Cancel to Reset": Clear the Alert Probe or Insert ProbeJennAir Range Display "Probe" or "Insert Probe": Meat Probe Not Detected PUSH or PSHJennAir Range Display "PUSH" or "PSH": Press Start to Begin

3d213d21 questions

My oven preheated slowly before 3d21. Related?

It can be. A sensor on its way out may report the wrong temperature, so the oven overshoots or lags before the control gives up and shows the code.

Is 3d21 an electrical safety risk?

The code itself is about a reading, not a short circuit. Still, wiring is part of the meaning, so do not try to inspect it with the power on.

How much will a sensor repair cost?

That depends on what the test shows. We give you the price in writing before any work, and approved repairs include a 30-day workmanship warranty.