Written by
Elena Marsh Appliance Care EditorPublished October 29, 2026
VERIFIED
Error code3d/12
ApplianceRange
Reading 3d/12 on the display
The oven temperature sensor is what this pair blames. Kenmore 665 model freestanding ranges print codes in slash format, and 3d/12 has three siblings with an identical meaning: 3d/11, 3d/21 and 3d/22.
Why the harness comes first
Power is removed before anything else. Loose wires on the sensor harness get pushed on again, and a harness showing damage is swapped. Only then does a technician connect a volt/ohm meter to read the sensor’s resistance. Should the figure differ from the manual’s value, the sensor is replaced. Where sensor and wiring both pass, the electronic oven control is replaced.
For 3d/12 on a Kenmore range in the Bay Area, call (415) 825-6393 and ask for a technician visit. Share the model number from the range, the code, and anything you tried with the harness. Kenmore range repair is described on its own page.
Model compatibility: Kenmore reuses codes across series and model years, so 3d/12 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.
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.
Seeing this code on your Kenmore appliance?
Book a specialist visit for a clear estimate and approval before any repair.
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