KitchenAid Over-the-Range Microwave Code F8E5: Exhaust air sensor in the hood unit

What F8E5 means

On KitchenAid over-the-range microwave hood combinations such as the KMLS311HSS and KHMS155LSS, F8E5 points to the exhaust air temperature sensor, or the wiring serving it. The sensor measures air leaving the unit so the control can protect against overheating. When the reading is lost, the display shows F8E5 and cooking stops. Fan noise may continue while the microwave itself refuses to heat, which can be confusing.

Common causes of F8E5

Exhaust air temperature sensor with a bad reading
Wiring to that sensor that has loosened or been damaged

✓ One safe check you can try

1. Press Cancel, then glance at the display. 2. Check the top and underside grilles for grease build-up or blockage, and wipe the visible surfaces. 3. Unplug the unit for a minute, or use the breaker, and restore power. 4. If F8E5 returns after a short cycle with water, call us.

! Why to stop there

The sensor is inside the cabinet of a unit hung above your range.
A greasy, hot area makes wiring brittle, and only a technician can inspect it safely.
We quote first and replace only what testing confirms.

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 E8KitchenAid Combination Microwave Code F4 E8: Inverter or its wiring flagged F9 or F9E0KitchenAid Built-In Microwave Code F9 or F9E0: Check the electrical connection after installation Press Cancel to ResetKitchenAid Built-In Microwave Message "Press Cancel to Reset": Clear it, then reset power if Call Service shows

F8E5F8E5 questions

Does cooking grease matter?

Greasy vents hold heat. The listed cause is the sensor or wiring, but a clean grille helps airflow, so tidy the visible parts before the visit.

Why does F8E5 stop all cooking?

The control relies on this reading to prevent overheating. Without it the microwave plays safe and halts. It simply cannot confirm safe air temperatures, so it plays safe and stops everything.

Is it the same as F8 E5 on a built-in?

The sensor description matches, but the unit type is different. We treat each model on its own wiring layout. Same sensor wording, but a different mounting and wiring layout; we check each model on its own.