What the code means
Jenn-Air documents F4 E5 as a possible problem with the microwave weight sensor or its wiring. Weight-based programs need that reading to set cooking times, so they may refuse to run while the code shows. Check the tray or floor is seated and clear, and use timed heating meanwhile if the unit allows it.
Error codes
Reference| Code | Meaning |
|---|---|
| F4 E5 | There may be a problem with the Microwave Weight Sensor, or the associated wiring. |
What the oven does alongside the code
- Weight-based programs refuse to start — Auto defrost or auto cook by weight cancels with the code.
- The code followed a spill — Liquid that ran beneath the tray can reach the sensing area.
- Timed heating may still work — On some models a plain timed heat runs without the weight reading.
- NEAR MISS: the turntable does not turn — A turntable that stops is a drive coupler or motor matter, not the weight sensor.
Likely causes, ranked
- The weight sensor — Ranked first because the documented meaning for F4 E5 names the weight sensor and its wiring, which points at the sensing circuit rather than at the load.
- A tray not seated, or something beneath it — A weight reading depends on the load resting where the sensor expects; a tray off its supports or debris beneath it upsets the reading.
- Spills reaching the sensor area — Liquid that runs under the tray or floor can reach the sensing mechanism.
Check in this order
- Check the tray or floor — Lift the tray, wipe beneath it, and reseat it on its supports.
- Start with an empty cavity — Reset with nothing inside, so the sensor can read a true zero.
- Try a timed heat — With a cup of water inside, a plain timed heat shows whether the rest of the section works.
- Sensor testing — Testing the weight sensor means opening the cabinet: technician work.
What an owner can safely do
- Reseat the tray — Remove the tray or turntable and its support, clean beneath, and refit both so the tray sits level.
Tools: soft clothAbout 5 min
- Dry any spill — If liquid ran under the tray, wipe it up and leave the door open to dry.
Tools: soft clothAbout 15 min
- Reset with the cavity empty — Switch off at the breaker for a few minutes with nothing inside, then back on.
About 5 min
- Stop here if the next check needs a meter — Testing a part or its wiring means live terminals or disassembly, which is technician work.
Before you open anything
Safety
Unplug the appliance or switch off its breaker before removing any panel. A capacitor can hold a charge after the power is off. The weight sensor sits inside the microwave cabinet near high-voltage parts; owner checks stop at the tray, the cavity and the door. Let the cavity and any surface units cool fully before reaching in or behind them.
When to call a technician
Call for service if F4 E5 returns after the tray has been reseated and the unit reset with the cavity empty, or if timed heating also fails. The weight sensor sits inside the microwave cabinet with high-voltage parts.
Nearby codes on the same oven line
Scope of this code reading
Generalized information: F4 E5 is read here for the Jenn-Air oven line as a whole, which fits Jenn-Air combination units with a weighing microwave section whose code list carries F4 E5. It is not a reading for microwaves without a weight sensor, oven codes, and models that read F4 E5 differently. Model lines can reuse a code with another meaning, so a model-specific page, where one exists, comes first.
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Experienced technician with 12 years specializing in washing machine and dryer repairs across all major brands.
