KitchenAid Combination Microwave Code F4 E5: Weight sensor in the microwave cavity

What F4 E5 means

On a KitchenAid combination microwave-wall oven, for instance the KOCE900HSS, F4 E5 indicates a possible problem with the microwave weight sensor or its wiring. The weight sensor helps the control judge the amount of food for automatic programs. When the signal is missing, the upper cavity shows F4 E5 and the microwave side will not complete a cycle. The lower oven normally carries on cooking as before.

Common causes of F4 E5

Microwave weight sensor producing no reading or an out-of-range one
Wiring to the weight sensor that has loosened or been damaged

✓ One safe check you can try

1. Remove everything from the microwave cavity, including plates and containers. 2. Press Cancel, then switch the breaker off for a minute and restore it. 3. Start a short timed cycle with a cup of water to see whether F4 E5 returns. 4. If it does, stop using the microwave side and schedule a visit.

! Why to stop there

The weight sensor lies beneath the cavity floor, which is not reachable without dismantling the unit.
A sensor reading cannot be confirmed by eye; it takes a meter and a reference.
Our visit includes a price quote before work starts, and nothing is replaced on a guess.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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Other Microwave codes

Probe or Insert ProbeKitchenAid Combination Microwave Message "Probe" or "Insert Probe": Seat the meat probe in its jack PUSH or PSHKitchenAid Built-In Microwave Message PUSH or PSH: The oven is waiting for Start Registration ErrorKitchenAid Over-the-Range Microwave Message "Registration Error": Check the home network and try again Sabbath, Sab, 5Ab, or 5A6KitchenAid Built-In Microwave Display Sabbath, Sab, 5Ab or 5A6: Sabbath Mode is on SEKitchenAid Over-the-Range Microwave Code SE: Keypad or user interface problem F4 E4KitchenAid Combination Microwave Code F4 E4: Humidity sensor signal missing from the cavity F8 E4KitchenAid Built-In Microwave Code F8 E4: Exhaust fan air sensor circuit LOC or "L" or Padlock IconKitchenAid Countertop Microwave Display LOC, L or Padlock: Control Lock is enabled

F4 E5F4 E5 questions

Is F4 E5 caused by a heavy dish?

The code points to the sensor or wiring, not to load size. Still, empty the cavity and check that the turntable is seated correctly, then reset power once.

Do I need to replace the whole oven?

Not based on this code alone. It names a sensor and wiring, so the repair is usually targeted. We confirm the part before quoting the job.

Can I use the lower oven?

The code concerns the upper microwave cavity. Many owners continue using the lower oven while the microwave half waits for repair, as long as no other message appears.