What F4 E5 Means
Built-In Microwave, including the microwave-oven combination: KitchenAid publishes for F4 E5 "There may be a problem with the Microwave Weight Sensor, or the associated wiring." Some models weigh what you put in and use that to calculate a cooking time. The weight sensor is that scale. A fault against it takes away the weight-based automatic programs and nothing else - the appliance heats exactly as well as it did before.
Common Causes of F4 E5
- A weight sensor out of calibration or failed
- Something resting against the turntable support that loads the sensor oddly
- Wiring between the sensor and the control
🔧 One Safe Check You Can Try
Let the appliance cool and keep the door shut, then cut power at the breaker rather than reaching behind a built-in cabinet for a plug: power the unit down by switching off the circuit breakers for one minute, power it back up, watch the oven for one minute to see whether the code returns, and verify the oven operates.
⚠ Why You Shouldn't Go Further Than That
- This is a comfort feature rather than a protection, so the useful caution is the opposite one: do not let a minor code talk anyone into opening an appliance whose capacitor stays charged after it is unplugged.
- The high-voltage capacitor inside a microwave can hold a lethal charge after the unit is unplugged and the display is dead, so the inside of the cabinet is not an owner check at any point in this process, whatever the code turns out to mean.
- KitchenAid names more than one possible culprit in the same sentence, so buying whichever part is cheapest to find is a coin toss rather than a repair.
Opening a panel to inspect or repair something yourself doesn't automatically cancel your manufacturer's warranty — but it can risk accidental damage, and some manufacturers do have specific service conditions. Check your product's warranty terms, or ask us, before deciding.