KitchenAid Combination Oven Code F4 E2: microwave sensor reading lost

What F4 E2 means

A KitchenAid combination microwave-wall oven such as the KOCE900HSS can display F4 E2 when the microwave sensor or thermistor, the microwave appliance manager, or the associated wiring may have a problem. This concerns the upper microwave cavity. The display shows the code, and a microwave cycle may end early or never begin. Both a sensing part and a control are named, which is why we test the whole microwave sensing circuit rather than replace one part and hope.

Common causes of F4 E2

Microwave sensor or thermistor out of range
Microwave appliance manager failing
Wiring between the sensor and the manager is loose or damaged

✓ One safe check you can try

1. Cancel the cycle and empty the microwave cavity. 2. Switch the oven breaker off for a minute and restore it. 3. Heat a cup of water for thirty seconds to see if the code stays away. 4. If F4 E2 repeats, leave the microwave unused and call us.

! Why to stop there

Sensor, manager and wiring each show up as the same code.
Microwave cavities contain parts that stay dangerous when switched off.
Our quote is written and approved by you first, and the repair is covered for 30 days.

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.

→Same appliance

Other Wall Oven codes

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F4 E2F4 E2 questions

What separates F4 E2 from F4 E1?

F4 E1 lists a thermistor and the appliance manager. F4 E2 lists the microwave sensor or thermistor and the microwave appliance manager. They overlap, so we test the same circuit and read the result.

Does the code mean the microwave is unsafe?

It means the microwave cannot rely on a sensing circuit. The safe response is to stop using the microwave section until it is tested, and the lower oven can be judged separately.

Will heating water test it?

A short water test shows whether the code returns under load. It is not a repair, so a repeat code calls for a technician, who will quote the work in writing first.