Maytag Range Error Code 4d51

Error code 4d51 on a Maytag range indicates the control board has detected a door switch circuit failure in the upper or single oven cavity. Specifically, the board cannot confirm a valid open or closed state from the door switch - the circuit is returning a signal that falls outside expected parameters for either position. This typically points to a fault in the door switch itself, the wiring harness connecting it to the control board, or a damaged connector at either end of that circuit.

For homeowners, the door switch is a small component that tells the oven's control board whether the oven door is open or closed. This information is used to control the oven light, manage broil and bake cycles, and in some models, operate the door lock during self-clean. When the board cannot read a clear signal from this switch, it throws the 4d51 code and may restrict certain oven functions as a precaution.

The code triggers when the door switch circuit produces an indeterminate or out-of-range reading rather than a clean open or closed signal. Physical damage to the switch, a loose or corroded wiring connection, or a broken wire in the harness are the most common causes. The door switch itself is a relatively inexpensive part and is accessible without major disassembly on most Maytag range models.