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Error code reference

Jenn-Air Microwave Error Code F4E5

Weight sensor not within normal value.

Jenn-Air codesJenn-Air microwave codes

Weight sensor not within normal value.

First step from the service manual

Unplug oven or disconnect power, replace microwave oven weight sensor.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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  • Wiring diagram references and connector pinouts from the OEM service manual
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What F4E5 means on a Jenn-Air microwave

The F4E5 error code on a Jenn-Air microwave indicates that the weight sensor is reading a value outside its expected operating range. The weight sensor is used in sensor cooking and auto-weigh functions to detect the mass of food placed in the microwave, allowing the appliance to adjust cook time and power levels accordingly. When the control board receives a signal from this sensor that falls outside programmed thresholds, it triggers the F4E5 fault and halts normal operation to prevent inaccurate cooking cycles.

The most direct cause of this fault is a failed or degraded weight sensor assembly. Sensors of this type can drift out of calibration over time, develop internal electrical failures, or sustain physical damage from heavy cookware or impact. Wiring connections between the sensor and the control board can also contribute if a connection has loosened or corroded, producing an erratic or out-of-range signal at the board.

The recommended first diagnostic step is to disconnect power to the microwave before performing any inspection or repair. Because the sensor is the primary component flagged by this code, replacing the weight sensor is the indicated corrective action. Technicians should verify the wiring harness integrity during the replacement process to rule out connection issues that could cause the fault to reappear after a new sensor is installed.

Source: manufacturer service documentation.

Common causes of F4E5

  1. 01

    Failed weight sensor

    Part replacement

    The weight sensor itself has failed internally and is producing a signal outside the acceptable range. This is the most likely cause and replacement of the sensor is the primary recommended repair.

  2. 02

    Damaged weight sensor from impact or overload

    Part replacement

    Heavy cookware or a physical impact to the microwave cavity floor can damage the sensor. Inspect the sensor mounting area for visible cracks, deformation, or signs of stress.

  3. 03

    Loose or corroded wiring connection

    Wiring / connection

    The harness connector linking the weight sensor to the control board may have loosened or developed corrosion, causing an intermittent or out-of-range signal. Inspect connectors carefully during sensor replacement.

  4. 04

    Sensor calibration drift

    Part replacement

    Over extended use, the sensor can drift out of its calibrated range without complete failure. This typically presents as a fault that appears gradually rather than after a specific event.

See the test procedure for each cause

Frequently asked questions about F4E5

What does F4E5 mean on a Jenn-Air microwave?
F4E5 indicates that the weight sensor in your Jenn-Air microwave is reading a value outside its normal operating range. The weight sensor is used to detect food mass for automatic cooking functions. When the control board receives an out-of-range signal from this sensor, it triggers the F4E5 fault and stops operation until the issue is corrected.
Can I fix the F4E5 error myself?
The repair requires replacing the weight sensor after disconnecting power to the microwave. A technician or experienced DIYer comfortable working with appliance components can perform this repair. Always unplug the microwave before accessing any internal components, as microwave capacitors can retain a dangerous charge even after power is removed.
Is it safe to use my microwave while F4E5 is displayed?
The microwave will typically not operate normally while this fault is active, which prevents potentially inaccurate cooking cycles. Do not attempt to bypass the fault for continued use. Address the sensor issue before resuming operation.
Will resetting my Jenn-Air microwave clear the F4E5 code?
Disconnecting power may temporarily clear the fault display, but the F4E5 code will return if the underlying weight sensor problem has not been resolved. A reset alone is not a fix. The sensor must be inspected and replaced to permanently clear the code.
How much does it cost to repair the F4E5 error on a Jenn-Air microwave?
Repair costs vary depending on the specific model and whether you use a professional technician or perform the repair yourself. Parts costs for a weight sensor typically fall in the range of $30 to $100, while professional labor can add $75 to $200 or more depending on your location and the service provider.

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