The short answer
4d12 is a door-lock fault: the control asked the latch to move, or asked the switch to confirm a position, and did not get the answer it expected from the oven door latch assembly, the door switch, or the wiring between them. Do not force a locked door, and do not bypass the switch to get a cycle to run.
This code and its neighbours on this appliance
Reference| Code | Meaning |
|---|---|
| 4d12 | There may be a problem with the Oven Door Latch Assembly, the Door Switch, or the associated wiring. |
| 4d51 | There may be a problem with the Oven Door Latch Assembly, the Door Switch, or the associated wiring. |
| 4d11 | There may be a problem with the Oven Door Latch Assembly, the Door Switch, or the associated wiring. |
What you see alongside the code
- A grinding or buzzing from the top of the door frame — The latch motor labouring against an obstruction or a seized cam.
- The code cleared after the cavity cooled — Thermal distortion of the frame at clean temperature is a real and specific cause here.
- NEAR MISS - the door will not shut fully because of a rack or a pan — That is an obstruction, not a fault. Clear it and the code should not return.
Why this code appears, in order
- A misadjusted or worn door switch — It is the part that actually reports position, it is the cheapest thing in the circuit, and it wears from every door close.
- An obstruction in the latch path — A rack lip, a spilled deposit or a warped gasket stops the latch completing travel.
- A seized or failing latch motor and cam — The assembly is driven only during clean cycles, so it can sit unused for years and then refuse to move.
Check in this order, and why
- Check the door closes fully with nothing in its way — The cheapest cause and a real proportion of these codes - do it before anything else.
- Cut power for several minutes and restore it — Many controls re-home the latch on power-up, which both clears and tests it.
- Listen at the top of the door for the latch motor — Running on means a switch that is never satisfied; silence means a motor or supply fault.
The owner-safe procedure
- Open and close the door slowly, watching the frame — You are looking for a rack, a pan or a gasket edge catching.
About 5 min
- Switch off at the breaker for several minutes — On restoring power most controls re-home the latch, which clears a stalled one.
About 8 min
- Wipe the latch slot and the gasket seat clean — A cooled cavity only. Deposits in the slot are a genuine and common cause.
Tools: clothAbout 10 min
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel - a capacitor can hold a charge after the power is off. Never defeat, tape or bypass the door switch to get a cycle to run: it is what keeps the clean cycle from running with the door open, and bypassing it is the one modification on this appliance that can burn a house. Never force a door locked at clean temperature.
When this is a service call
Call when the door is still locked after the oven has cooled and been power-cycled, or when the latch motor runs on without stopping. Both mean the assembly or its switch needs replacing, and both sit behind the top trim next to the supply run. Call immediately rather than experimenting if the door locked during a clean cycle and the cavity is still hot.
Neighbouring codes on this appliance
What this page does not cover
Read this as generalized information. It is written for 4d12 as the KitchenAid oven code list documents it across the brand rather than for one family or model line. Where a family- or model-specific page exists for your unit it is the more specific answer and is linked from the code index for this appliance. The codes listed beside it in the table above carry the same documented meaning on this platform and are covered on their own pages, so check the characters on your display carefully before acting on this one.
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