What F4 E5 Means
Wall Oven and Combination Wall Oven: this code belongs to the microwave half of a combination appliance - the cavity that has a microwave in it as well as an oven. F4 E5 is published with the sentence that there may be a problem with the microwave weight sensor, or the associated wiring. On models that offer weight-based defrosting or cooking, that sensor is how the appliance judges how much food is in the cavity and therefore how long to run. A reading it cannot use leaves those programmes without their input, so they stop being offered. KitchenAid adds a note to the pages in this family that is worth knowing: the error code may display in F# E# format or in E# F# format, so the same fault can appear with the two halves swapped.
Common Causes of F4 E5
- The weight sensor producing a reading the control will not accept
- Something resting against or fouling the sensing mechanism in the cavity
- The wiring to the sensor loose or damaged
🔧 One Safe Check You Can Try
Let the cavity cool with the door closed before you do anything. An oven that has just been cooking holds enough heat to burn through a cloth, and a self-clean cycle leaves it far hotter than that. Take everything out of the cavity, including any turntable or rack that is not normally left in, and make sure nothing is wedged or resting against the cavity floor. Then power the oven down by switching off its circuit breakers for one minute, power it back up, watch it for one minute to be sure the code does not return, and verify the oven operates. If F4 E5 returns with an empty cavity, the sensing itself is the question rather than what was sitting on it.
⚠ Why You Shouldn't Go Further Than That
- A microwave stores energy in its high-voltage capacitor, and that charge does not drain when the power goes off, so the inside of the microwave half stays dangerous long after the breaker has been switched.
- Weight sensing is mechanical as well as electrical, and forcing or levering anything in the cavity floor to test it damages the mechanism the code is already complaining about.
- Anything behind the cavity is inside a combination housing that has to come out of the cabinet opening before it can be opened at all.
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.