Maytag Range F4 Error Code — What It Means
The F4 error code on a Maytag range or wall oven signals a temperature-sensing fault in the oven cavity. Maytag documentation indicates there may be a problem with the oven cavity control or the associated wiring. In most cases, F4 points to a failed oven temperature sensor, a damaged harness between the sensor and the control board, or a faulty control board itself. The oven will not operate normally until the fault is corrected.
Common Causes
- Failed oven temperature sensor probe The resistance element inside the sensor fails or drifts out of specification, preventing the control from reading accurate oven temperature.
- Damaged or loose wiring harness Connectors between the sensor and the control board become corroded, loose, or the wiring itself breaks, interrupting the signal.
- Faulty oven cavity control or ERC board If the sensor and wiring test correctly, the electronic control board that monitors the sensor circuit has failed internally.
- Power interruptions or voltage spikes Sudden loss of power or incorrect voltage can cause the control to log a fault code, though this is less common with F4 specifically.
Step-by-Step Fix
- Turn off power at the circuit breaker for the range for one full minute, then restore power and check whether the F4 code clears and the oven operates normally.
- Inspect the oven temperature sensor and its connector at the rear wall of the oven cavity for visible damage, corrosion, or loose connections.
- Measure the sensor resistance using a multimeter at room temperature. A typical Maytag/Whirlpool-family sensor reads around 1,100 Ω at room temperature. Compare your reading to the specification in your model’s service manual.
- Check continuity through the harness by measuring resistance at both the sensor end and the control-board connector. If the sensor reads correctly but the board-side connector does not, the harness is faulty.
- Replace the sensor if resistance is far from specification or the sensor is visibly damaged.
- Replace the wiring harness if you measured correct resistance at the sensor but open or incorrect resistance at the control-board end.
- Replace the oven cavity control or ERC board if the sensor and harness both test good but the F4 code persists after power reset.
- Restore power and verify the oven heats to the set temperature without triggering the code again.
Parts Often Needed
| Part | Notes |
|---|---|
| Oven temperature sensor | Amazon | Verify the part number against your exact model. Example part AP204836 fits many Maytag ranges. |
| Sensor wiring harness | Amazon | Order the model-specific harness if you find breaks or corrosion. Example part AP308592. |
| Oven control board (ERC or cavity control) | Amazon | Confirm the board part number from your model tag. Example part AP382905. |
When to Call a Pro
Call a qualified appliance technician if you are uncomfortable working with 240-volt wiring, if you cannot access the sensor or control board safely, or if the F4 code returns after you have replaced the sensor and verified the harness. A technician has model-specific wiring diagrams and the test equipment to pinpoint control-board failures quickly. If your range is still under warranty, contact Maytag service before replacing any parts.