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Error code reference

GE Range Error Code F74

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

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What the F74 error code actually means

Your GE range has detected that one of its internal control boards, an add-on module that helps manage certain functions, has stopped communicating with the main controller. Think of it like two computers in the range that need to talk to each other, and one has gone silent. A technician will need to inspect the wiring between these boards or replace the secondary board to resolve the issue.

Diagnostic procedure

The full F74 procedure

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1
First diagnostic step
Replace AUX Board especially if MAIN Board relays still function.
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Most common causes of F74

Ranked by how often they cause this code
  1. 1Failed AUX Board
  2. 2Loose or Corroded Wiring Harness Connector
  3. 3Damaged LIN Bus Wiring
  4. 4Failed Main Control Board

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Questions people ask 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.
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 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.
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.
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.

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