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Error code reference

Whirlpool Microwave Error Code F4E5

Microwave weight sensor not within normal value.

Whirlpool codesWhirlpool microwave codes

Microwave weight sensor not within normal value.

First step from the service manual

Unplug oven or disconnect power and 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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What F4E5 means on a Whirlpool microwave

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

The most direct cause of this error is a failed or out-of-range weight sensor component. The sensor may have developed an internal fault, suffered physical damage, or experienced a connection issue that causes it to transmit an incorrect signal to the control board. Wiring harness problems between the sensor and the control board, such as loose connectors or damaged conductors, can also produce this fault by introducing signal irregularities.

Because the first recommended diagnostic step is to disconnect power and replace the weight sensor directly, this fault is generally treated as a component failure rather than a calibration or control board issue. Technicians should confirm all wiring connections are secure before replacing the sensor, but sensor replacement is the primary corrective action for this code.

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

    Loose or disconnected wiring connector

    Wiring / connection

    The connector linking the weight sensor to the control board may have come loose, causing an open or intermittent signal. Inspecting and reseating the harness connector at both the sensor and board ends can rule this out before replacing the sensor.

  3. 03

    Damaged wiring harness

    Part replacement

    A wire in the harness between the weight sensor and the control board may be pinched, frayed, or broken, resulting in a faulty signal reading. Visual inspection of the harness routing should be performed during diagnosis.

  4. 04

    Control board misreading the sensor signal

    Part replacement

    In less common cases, the control board itself may be failing to correctly interpret a signal from an otherwise functional sensor. This would typically be considered only after sensor and wiring have been confirmed good.

See the test procedure for each cause

Frequently asked questions about F4E5

What does F4E5 mean on a Whirlpool microwave?
F4E5 indicates that the microwave's weight sensor is producing a value outside its normal operating range. The weight sensor is used to automatically detect food mass and adjust cook settings. When its signal falls outside accepted limits, the control board logs this fault and may disable sensor-based cooking functions. Replacing the weight sensor is the primary corrective action.
Can I fix the F4E5 error myself?
A knowledgeable DIYer can attempt this repair by first unplugging the microwave and checking that all wiring connectors related to the weight sensor are secure. If connections look good, the weight sensor itself will need to be replaced. Keep in mind that microwave capacitors can retain a dangerous electrical charge even after being unplugged, so caution and proper knowledge of capacitor discharge procedures are important before working inside the unit.
Is it safe to use my microwave while it shows the F4E5 error?
The F4E5 fault is tied to the weight sensor circuit, which supports automatic sensor cooking features. Basic manual microwave operation may still function, but using the appliance in a fault state is not recommended. It is best to resolve the error before continued use to ensure accurate cooking performance and avoid potential secondary issues.
Will resetting the microwave clear the F4E5 error?
Unplugging the microwave or cutting power may temporarily clear the error code from the display, but the fault will return if the underlying sensor problem has not been addressed. A reset alone does not correct a failed weight sensor or wiring issue. The error will persist until the faulty component is repaired or replaced.
How much does it cost to repair a Whirlpool microwave F4E5 error?
Repair costs vary depending on whether you choose a DIY approach or hire a technician. The weight sensor part itself typically falls in the range of $20 to $80 depending on the specific model. If a professional appliance repair technician performs the work, total costs including labor can range from $100 to $250 or more. In some cases, the cost of repair may approach the cost of replacing an older microwave, so it is worth comparing both options.

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