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Error code reference

Jenn-Air Range Error Code 1c4c

Board-to-board communication failure between display and relay boards.

Jenn-Air codesJenn-Air range codes

Board-to-board communication failure between display and relay boards.

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What 1c4c means on a Jenn-Air range

Error code 1c4c on a Jenn-Air range indicates a board-to-board communication failure between the display board and the relay board. These two control boards work together as a system: the display board handles user input and interface functions, while the relay board controls the actual power switching for oven elements and burner components. When the communication link between them breaks down, the range cannot reliably translate user commands into heating operations, and the control system flags this fault code.

The communication between these boards typically runs over a data bus or serial communication line using dedicated signal wiring and connectors. A failure can originate from either board or from the wiring harness connecting them. Loose, corroded, or damaged connector pins are among the most frequent physical causes. Voltage spikes or power surges can also corrupt or damage the communication circuitry on one or both boards, making them unable to exchange data properly.

Because this fault involves two separate electronic components, diagnosis requires checking the wiring and connectors first before condemning either board. If the connector and harness check out, one or both boards may need to be replaced. This is generally not a code that resolves itself through a simple reset, since the underlying hardware issue remains even after power is restored to the unit.

Source: manufacturer service documentation.

Common causes of 1c4c

  1. 01

    Loose or damaged wiring harness connector

    Wiring / connection

    The connector linking the display board to the relay board can work loose over time or suffer pin damage from heat cycling. Inspect the connector on both ends for bent pins, corrosion, or a loose fit.

  2. 02

    Failed relay board

    Part replacement

    The relay board's communication circuitry can fail due to age, heat stress, or a power surge. If the wiring harness checks out, the relay board is a likely culprit and will need to be replaced.

  3. 03

    Failed display board

    Part replacement

    The display board can also lose its ability to communicate over the data bus, particularly after a power surge or component failure on the board itself. Replacement is required if the board is confirmed faulty.

  4. 04

    Power surge or voltage spike

    Part replacement

    A sudden voltage event can disrupt or permanently damage the communication circuitry on either board. If the code appeared after a power outage or storm, surge damage should be considered.

  5. 05

    Corroded or oxidized connector pins

    Wiring / connection

    Over time, connector pins on the inter-board harness can oxidize, increasing resistance in the communication circuit enough to cause data errors. Cleaning or replacing the connector may restore communication.

See the test procedure for each cause

Frequently asked questions about 1c4c

What does 1c4c mean on a Jenn-Air range?
The 1c4c code indicates a board-to-board communication failure between the display board and the relay board inside the range. These two boards must exchange data continuously for the oven to function, and when that link is broken, the range displays this fault and stops operating normally. The cause can be a faulty wiring harness, damaged connector, or a failed board on either end of the communication circuit.
Can I fix the 1c4c error code myself?
A homeowner with basic electrical knowledge can check for obviously loose connectors inside the range after disconnecting power, but diagnosing which board has failed typically requires test equipment and experience with appliance electronics. If the connectors look secure and undamaged, replacing the relay board or display board is best left to a qualified technician. Incorrect board handling can cause additional damage.
Is it safe to use my Jenn-Air range while the 1c4c code is active?
It is not recommended to operate the range while this code is present. The communication failure between the display and relay boards means the control system cannot reliably manage heating elements, which creates an unpredictable and potentially unsafe operating condition. The range should remain off until the fault is diagnosed and repaired.
Will resetting the range clear the 1c4c error code?
Resetting the range by cutting power at the breaker may temporarily clear the code, but it is very likely to return quickly because the underlying hardware problem remains. A reset does not repair a damaged connector, a broken wiring harness, or a failed board. Persistent return of the code after a reset confirms a physical fault that requires hands-on diagnosis.
How much does it cost to repair a 1c4c error on a Jenn-Air range?
Repair costs vary depending on whether the fix requires only a connector or harness repair versus full board replacement. A relay board or display board replacement, including parts and labor, typically falls in the range of $200 to $600 or more depending on the specific model and local labor rates. Getting a diagnostic visit from a certified technician first will help identify whether one or both boards need to be replaced before committing to parts costs.

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