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Error Code

Kenmore Range Code 3d/21 Oven Sensor Defective

Plain-language guidance for Kenmore code 3d/21 on Range — symptoms, safe checks, and when to call a technician.

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At a glance

Error code overview

A plain-language snapshot of 3d/21 for Kenmore Range — confirm the model series before you act.

Daniel Reeves Written by Daniel Reeves Appliance Repair Content Specialist Published October 20, 2026

Content status Verified

Error code 3d/21
Appliance Range
Quick answer

On the Kenmore 665 model range, 3d/21 stands for a defective oven temperature sensor.

Model compatibility

Kenmore reuses codes across series and model years, so 3d/21 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.

Plain language

What this code means

Defective oven temperature sensor.

Quick facts

  • Code: 3d/21
  • Condition: defective oven temperature sensor
  • Covers: Kenmore 665 model freestanding range

The manual’s approach

  1. Cut power, or unplug the range.
  2. Plug back in any wires loose on the sensor harness, and replace that harness when damaged.
  3. Have the sensor resistance measured with a volt/ohm meter; a sensor off the manual’s number gets replaced.
  4. Sensor and connections good? Replace the electronic oven control.

Related entries

  • 3d/12: same sensor condition
  • 3d/11: listed beside it in the manual
  • 4d/11: door and door lock switches disagree
  • 1d/22: oven too hot in Clean mode

Kenmore range service in the Miami, New York, Houston, Los Angeles and San Diego metro areas

Calling about 3d/21? In the Miami, New York, Houston, Los Angeles and San Diego metro areas, dial (844) 747-3641. Note the model number, the code and any manual steps you completed first. The range repair page explains the rest.

Source: Sears PartsDirect – Kenmore 665 model freestanding range error codes (slash format)

Caution

Safety warning

Important safety warning

Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.

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(844) 747-3641
Phone (844) 747-3641
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