Jenn-Air Oven Error Code F1E5-4

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.

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.

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.

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.

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.