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Error code reference

GE Range Error Code F74

LIN comm error to/from RPSM AUX Board (when equipped).

GE codesGE range codes

LIN comm error to/from RPSM AUX Board (when equipped).

First step from the service manual

Replace AUX Board especially if MAIN Board relays still function.

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

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What F74 means on a GE range

The F74 error code on a GE range indicates a LIN communication failure between the main control board and the RPSM AUX (auxiliary) board. LIN, or Local Interconnect Network, is a serial communication protocol used to allow multiple control modules to exchange data over a single wire. When the main board cannot establish or maintain reliable communication with the AUX board, it triggers F74 to alert the technician that the secondary control module is either unresponsive or sending corrupted data.

The RPSM AUX board is only present on certain GE range configurations, typically higher-end models with expanded burner or surface element control. This board handles auxiliary relay and switching functions that the main board delegates to it. A breakdown in LIN communication can stem from a failed AUX board, a wiring harness fault between the two boards, or corrupted firmware on the AUX module. Because the error is specifically a communication fault rather than a relay or output fault, the main board relays may continue to operate normally even while F74 is active.

Diagnosis should begin by confirming that the main board relay functions are still operating correctly. If the main board relays respond as expected, this strongly points to the AUX board as the source of the communication failure rather than the main board itself. Inspect the wiring harness and connectors between both boards for damage, corrosion, or loose pins before condemning the AUX board, as a poor connection on the LIN bus wire can produce identical symptoms.

Source: manufacturer service documentation.

Common causes of F74

  1. 01

    Failed AUX Board

    Part replacement

    The RPSM AUX board itself may have an internal failure causing it to stop responding on the LIN bus. This is the most likely cause when main board relay functions remain intact.

  2. 02

    Loose or Corroded Wiring Harness Connector

    Wiring / connection

    A poor connection at either end of the harness linking the main board and AUX board can interrupt the LIN communication signal. Inspect both connectors for bent pins, corrosion, or incomplete seating.

  3. 03

    Damaged LIN Bus Wiring

    Wiring / connection

    Physical damage to the wire carrying the LIN signal, such as a pinch, burn, or break in the harness, can prevent data from passing between the two boards. Trace the harness carefully for any visible damage.

  4. 04

    Failed Main Control Board

    Part replacement

    In less common cases, the main board may be unable to properly drive or read the LIN bus even though its relays still function. This is a secondary consideration after the AUX board and wiring have been evaluated.

See the test procedure for each cause

Frequently asked questions about F74

What does F74 mean on a GE range?
F74 indicates a LIN communication error between the main control board and the RPSM AUX board. This error only appears on GE ranges equipped with an auxiliary control module. The main board is detecting that it cannot reliably communicate with the AUX board over the LIN serial data line. It does not necessarily mean the main board or heating elements have failed.
Will resetting the range clear the F74 error?
Cycling power to the range may temporarily clear the F74 code, but it will almost certainly return if the underlying communication fault is not repaired. A reset does not fix a failed AUX board or a damaged wiring harness. Use a reset only to confirm whether the fault is intermittent while you proceed with diagnosis.
Is it safe to use my GE range while F74 is displayed?
Because F74 is a communication fault with an auxiliary board, the main board relay functions may still work normally. However, any features controlled by the AUX board may not operate correctly or safely. It is best to avoid relying on the range for full cooking use until the fault is diagnosed and repaired.
How do I fix the F74 error on my GE range?
Start by checking that the main board relays still function properly. If they do, inspect the wiring harness and connectors between the main board and the AUX board for loose pins, corrosion, or damage. If the wiring looks intact, the next step is to replace the RPSM AUX board, as it is the most likely failed component when main board relay operation is confirmed.
How much does it cost to repair a GE range F74 error?
Repair costs depend on whether the fix requires a new AUX board or just a wiring repair. An AUX board replacement typically runs in the range of $150 to $400 for the part alone, with additional labor costs if a professional technician is needed. A wiring harness repair is generally less expensive but requires time to properly inspect and trace the LIN bus circuit.

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