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Error code reference

Kenmore Range Error Code 4d52

Lower oven door switch is neither open nor closed

Kenmore codesKenmore range codes

Lower oven door switch is neither open nor closed – disables convection, cleaning and locking functions; turns off oven light.

First step from the service manual

Check door switch for proper operation; check wiring.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What 4d52 means on a Kenmore range

Error code 4d52 on a Kenmore range indicates that the lower oven door switch is in an indeterminate state, meaning the control board cannot confirm whether the door is open or closed. This switch is a critical input for the oven's control system, as it signals the board about door position during normal operation, convection cooking, and self-clean cycles. When the switch signal falls outside the expected parameters for either a fully open or fully closed position, the board flags the fault and disables several dependent functions.

The functions affected by this code are significant: convection operation is disabled, the self-clean and door locking mechanism are taken offline, and the oven interior light is turned off. This wide impact reflects how central the door switch signal is to safe oven operation. The locking function is particularly tied to door position feedback because the control board relies on confirmed door closure before initiating a high-temperature clean cycle.

The most direct causes involve the door switch itself or the wiring connecting it to the control board. The switch may be mechanically worn, physically damaged, or misaligned so that its internal contacts do not make a definitive open or closed connection. Wiring issues such as loose connectors, corroded terminals, or damaged insulation between the switch and the board can produce the same ambiguous signal. Inspecting the switch for proper actuation and checking the associated wiring harness for continuity and secure connections are the recommended starting points for diagnosis.

Source: manufacturer service documentation.

Common causes of 4d52

  1. 01

    Faulty or worn door switch

    Part replacement

    The lower oven door switch may have worn internal contacts or mechanical damage that prevent it from registering a definitive open or closed state. Testing the switch for proper actuation and continuity will confirm whether it needs replacement.

  2. 02

    Misaligned door switch

    Wiring / connection

    If the switch is not properly positioned relative to the door's actuating tab or strike, it may hover between open and closed positions without fully engaging. Inspecting the switch mounting and alignment can identify this issue without necessarily requiring new parts.

  3. 03

    Loose or corroded wiring connector

    Wiring / connection

    A connector that has worked loose or developed corrosion at the switch terminals can interrupt the signal to the control board, producing an indeterminate reading. Visually inspecting and reseating connectors along the door switch wiring harness is an early diagnostic step.

  4. 04

    Damaged wiring harness

    Part replacement

    Wires running to the door switch can sustain insulation damage from heat exposure or physical wear, causing intermittent or incorrect signals. A continuity check along the harness will reveal any breaks or shorts.

  5. 05

    Failed control board

    Part replacement

    If the switch and wiring both test correctly, the control board itself may be failing to properly read the switch input signal. This is a less common cause and should be considered only after the switch and wiring have been ruled out.

See the test procedure for each cause

Frequently asked questions about 4d52

What does 4d52 mean on a Kenmore range?
Error code 4d52 means the lower oven door switch is in an indeterminate state and the control board cannot confirm whether the door is open or closed. In response, the oven disables convection cooking, the self-clean cycle, the door locking function, and turns off the oven interior light. The most common causes are a faulty switch, a misaligned switch, or a wiring issue between the switch and the control board.
Can I fix error code 4d52 myself?
A knowledgeable DIYer can start by inspecting the door switch for visible damage, checking that it is properly aligned with the door, and reseating any loose wiring connectors. If the switch needs to be tested for continuity or replaced, basic electrical diagnostic skills and a multimeter are required. If the wiring harness or control board is involved, professional repair is recommended.
Is it safe to use my Kenmore range while code 4d52 is active?
Basic baking and broiling functions may still operate, but convection cooking and the self-clean cycle are disabled while this code is active. Because the oven cannot confirm door position, using high-heat or locked-door functions is not advisable until the fault is resolved. It is best to address the underlying switch or wiring issue before resuming full oven use.
How much does it cost to repair error code 4d52 on a Kenmore range?
If only the door switch needs replacement, parts typically range from around $15 to $60 depending on the model, and the repair is relatively straightforward. If a wiring harness repair or control board replacement is required, total repair costs including labor can range from $150 to $400 or more. Getting a diagnosis before ordering parts helps avoid unnecessary expenses.
Will resetting the oven clear error code 4d52?
Resetting the oven by cutting power at the breaker for a few minutes may temporarily clear the code, but it will return if the underlying switch or wiring problem has not been corrected. The code is triggered by an active hardware fault, not a software glitch, so a reset alone is not a solution. The door switch and its wiring need to be inspected and repaired or replaced to permanently resolve the error.

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