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Error code reference

Jenn-Air Microwave Error Code F1E6

Internal failure

Jenn-Air codesJenn-Air microwave codes

Internal failure - check microwave oven wave guide thermistor.

First step from the service manual

Unplug oven or disconnect power, replace microwave oven wave guide thermistor.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
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What F1E6 means on a Jenn-Air microwave

The F1E6 error code on a Jenn-Air microwave indicates an internal failure tied specifically to the wave guide thermistor. The wave guide thermistor is a temperature-sensing component mounted near or on the wave guide cover inside the microwave cavity. Its job is to monitor heat levels in the wave guide area and send resistance-based signals to the control board. When the control board receives a signal that falls outside the expected parameters, either due to an open circuit, a short, or a resistance value that is out of range, it flags the F1E6 fault and halts operation to prevent damage.

The most direct cause of this fault is a failed thermistor, which can happen due to overheating events, food splatter contamination, or simple component wear over time. A damaged or arced wave guide cover can also expose the thermistor to abnormal heat levels, accelerating failure. In some cases, the wiring harness connecting the thermistor to the control board may be the actual fault point, with a broken wire or a loose connector producing the same out-of-range signal the board interprets as a thermistor failure.

Because this is classified as an internal failure, the recommended first step is to disconnect power to the unit before any inspection or repair. The thermistor itself is the primary replacement target. If a new thermistor does not resolve the fault, the wiring harness and control board connections should be inspected carefully before replacing the board.

Source: manufacturer service documentation.

Common causes of F1E6

  1. 01

    Failed wave guide thermistor

    Part replacement

    The thermistor itself has burned out, shorted, or drifted out of its acceptable resistance range, causing the control board to log the F1E6 fault. This is the most common cause and replacement of the thermistor is the primary recommended repair.

  2. 02

    Overheating due to damaged wave guide cover

    Part replacement

    A cracked, warped, or arced wave guide cover can allow excess heat and energy to reach the thermistor, causing it to fail prematurely. Inspect the wave guide cover for burn marks or physical damage before installing a new thermistor.

  3. 03

    Loose or damaged wiring harness connector

    Wiring / connection

    A connector that has vibrated loose or a wire that has chafed or broken in the harness between the thermistor and the control board can produce the same signal the board reads as a thermistor failure. Check all connections at the thermistor and along the harness path.

  4. 04

    Food residue or moisture contamination

    Wiring / connection

    Splattered food or condensation on or around the thermistor can alter its resistance reading or cause intermittent shorts. Cleaning the area may resolve intermittent faults, but a contaminated thermistor often needs replacement.

  5. 05

    Control board fault

    Part replacement

    If the thermistor and all wiring check out correctly, the control board itself may be misreading the thermistor signal due to a board-level component failure. This is the least likely cause and should only be considered after the thermistor and harness are confirmed good.

See the test procedure for each cause

Frequently asked questions about F1E6

What does F1E6 mean on a Jenn-Air microwave?
F1E6 indicates an internal failure related to the wave guide thermistor, a temperature sensor located near the wave guide inside the microwave cavity. The control board has detected that the thermistor signal is outside acceptable parameters, so the microwave has stopped operating as a protective measure. The fault points directly to the thermistor as the primary component to inspect and replace.
Can I fix the F1E6 error myself?
A knowledgeable DIYer can address this repair, but microwave interiors contain high-voltage capacitors that can retain a lethal charge even after the unit is unplugged. Always discharge the capacitor before working inside the cabinet. If you are not comfortable working around high-voltage components, this repair is best left to a qualified appliance technician. The repair itself involves disconnecting power, accessing the thermistor, and replacing it along with any damaged wiring.
Is it safe to use my Jenn-Air microwave when F1E6 is showing?
No, you should not attempt to use the microwave while the F1E6 fault is active. The code indicates the temperature monitoring system for the wave guide area is not functioning correctly, which means the unit cannot properly detect an overheating condition. Continuing to operate it could result in further component damage or a fire hazard.
Will resetting the microwave clear the F1E6 error code?
Unplugging the microwave and restoring power may temporarily clear the fault display, but the underlying problem with the thermistor or its wiring will still be present. The code is very likely to return as soon as the microwave attempts to operate. A reset is useful for confirming whether the fault is intermittent, but it does not substitute for replacing the faulty thermistor.
How much does it cost to repair an F1E6 error on a Jenn-Air microwave?
Repair costs vary depending on whether the issue is limited to the thermistor or extends to the wiring harness or control board. Parts and labor for a thermistor replacement typically fall in the range of $100 to $250 at a service center, depending on local labor rates and parts availability. If the control board also needs replacement, costs can rise to the $300 to $500 range or higher, at which point comparing the repair cost to the value of the appliance becomes worthwhile.

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