Written by
Elena Marsh Appliance Care EditorPublished October 29, 2026
VERIFIED
Error code4d/51
ApplianceRange
Seeing 4d/51 means a Kenmore 665 model freestanding range has found its oven door switch and its door lock switch out of step with each other. Three more codes, 4d/11, 4d/12 and 4d/52, share the entry.
How the manual sorts it out
Open and close the door while looking at the oven light.
If the light fails to follow the door, replace the door switch.
If the light behaves, power comes off and any loose wires on the lock assembly’s harness are reconnected.
A damaged harness is replaced; so is a lock assembly with visible damage.
When the light test and the harness check leave 4d/51 on the display, phone (415) 825-6393 to set up a technician visit in San Francisco. Say how the light behaved and read out the model number. See Kenmore range repair for scope.
Model compatibility: Kenmore reuses codes across series and model years, so 4d/51 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
The door switch and lock switch disagree.
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.
You submit a request with your appliance model and symptom, we confirm an appointment window, and a technician performs an on-site diagnosis. You then receive a clear estimate and decide whether to proceed before any repair begins.
Yes. We provide an upfront estimate after diagnosis. No parts are ordered or installed until you approve the work, so there are no surprise charges.
Replacement parts are selected for the exact model and confirmed with you before ordering or installation.
Service areas are listed on the Locations page. Contact us with your ZIP code to confirm current coverage for your address.
Ready to get your Kenmore appliance working again?
Book a repair online or call us — clear estimates and approval before any repair work begins.
