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Error code reference

Jenn-Air Oven Error Code F1E5-4

Secondary ACU fault

Jenn-Air codesJenn-Air oven codes

Secondary ACU fault — ACU Bake relay open.

First step from the service manual

Unplug range or disconnect power. Inspect connections to main control for loose/unplugged connectors.

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

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What F1E5-4 means on a Jenn-Air oven

The F1E5-4 error code on a Jenn-Air oven indicates a secondary ACU (Appliance Control Unit) fault, specifically that the bake relay within the main control board is reading as open. The bake relay is an internal switching component on the ACU that controls power delivery to the bake element. When the control's self-diagnostic routine detects that this relay is in an open state when it should be closed, or cannot confirm proper relay operation, it logs the F1E5-4 fault and typically disables bake functions to prevent unsafe operation.

The most frequent root cause is a loose or disconnected wiring harness between the ACU and the bake circuit, which causes the control to misread the relay status. Corroded or poorly seated connector pins at the main control board can produce the same symptom without any actual relay failure. Because of this, the first diagnostic step is always to disconnect power and physically inspect all connectors at the ACU for secure seating and signs of heat damage or corrosion.

If the wiring and connectors check out correctly, the fault points to the ACU itself. A relay that has failed open internally cannot be repaired individually; the entire main control board requires replacement in that case. It is also worth inspecting the bake element and its associated wiring for any short or open condition that may have caused excessive current draw through the relay, contributing to relay failure over time.

Source: manufacturer service documentation.

Common causes of F1E5-4

  1. 01

    Loose or unplugged wiring connector at the ACU

    Wiring / connection

    A wiring harness that has worked loose from the main control board can cause the bake relay circuit to read as open. Inspect all connectors at the ACU for proper seating after disconnecting power.

  2. 02

    Corroded or damaged connector pins

    Wiring / connection

    Corrosion or heat damage on the connector pins leading to the ACU can interrupt the relay circuit signal. Look for discoloration, pitting, or oxidation on the pins and terminals.

  3. 03

    Failed bake relay on the ACU

    Part replacement

    The bake relay inside the main control board may have failed in an open position, preventing the circuit from closing. This requires replacement of the entire ACU board.

  4. 04

    Damaged wiring in the bake circuit

    Part replacement

    A broken or shorted wire between the ACU and the bake element can place abnormal load conditions on the relay circuit. Inspect the full length of the bake element wiring for burn marks or breaks.

  5. 05

    Failed bake element causing relay stress

    Part replacement

    A bake element that has shorted or opened over time may have drawn excess current through the relay, eventually causing it to fail. Test the bake element for continuity and visible damage.

See the test procedure for each cause

Frequently asked questions about F1E5-4

What does F1E5-4 mean on a Jenn-Air oven?
F1E5-4 indicates a secondary ACU fault where the bake relay inside the main control board is detected as open. The ACU is the appliance control unit, which manages all oven functions including power delivery to the bake element. When this relay fails to operate correctly, the oven records the fault and bake operation is typically disabled. The cause may be a loose wiring connection or a failed control board.
Can I fix F1E5-4 on my Jenn-Air oven myself?
A homeowner comfortable with appliance repair can start by unplugging the oven and reseating all wiring connectors at the main control board, which resolves the fault in some cases. If the connectors are secure and the fault returns, the repair moves on to testing the bake element and inspecting wiring, which requires more technical knowledge. Replacing the ACU board is a straightforward part swap for experienced DIYers, but working with high-voltage oven components always carries risk. If you are unsure, having a qualified technician complete the diagnosis is the safer choice.
Is it safe to use my Jenn-Air oven when the F1E5-4 code is showing?
You should not attempt to use the bake function while this fault is active. The error indicates the control board cannot reliably operate the bake relay, which means heating may not function correctly or at all. Continuing to operate the oven in a fault state can potentially worsen damage to the control board or associated wiring. Stop using the oven and diagnose the fault before resuming normal cooking.
Will resetting the oven clear the F1E5-4 error code?
Unplugging the oven for several minutes and restoring power may temporarily clear the fault code, but if the underlying problem is still present the code will return. A reset alone does not fix a failed relay or a damaged wiring connection. It can be useful as part of the diagnostic process to confirm whether the fault is persistent or intermittent, but a full inspection of connectors and components is still necessary.
How much does it cost to repair a Jenn-Air oven showing F1E5-4?
If the fix is simply reseating a loose connector, there is no parts cost and only your time is involved. If the main control board needs replacement, parts typically range from $150 to $350 or more depending on the specific model, with professional labor adding $100 to $200 on top of that. Diagnosing the fault correctly before ordering parts is important, since replacing the ACU without confirming the bake element and wiring are in good condition may not resolve the issue.

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