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Error code reference

GE Range Error Code F780

60 Hz square wave not getting to touch key chip on Main Logic Board.

GE codesGE range codes

60 Hz square wave not getting to touch key chip on Main Logic Board.

First step from the service manual

a) Check harness to J241 pin 4 for open. b) Replace Main Logic Board if voltage is OK to J241 pin 4. OR c) Replace Main RPSM Board if no voltage at RPSM J17 pin 9.

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

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What F780 means on a GE range

The F780 error code on a GE range indicates that the 60 Hz square wave signal is not reaching the touch key chip located on the Main Logic Board. This square wave is a timing reference signal used by the touch key chip to synchronize and process user inputs from the control panel. Without this signal, the touch interface cannot function properly and the control board registers a fault. The signal originates from the Main RPSM (Range Power Supply Module) Board and travels through the wiring harness to connector J241, specifically at pin 4, before reaching the touch key chip on the Main Logic Board.

The diagnostic process is structured around isolating where the signal is being lost. The first step is to inspect the wiring harness connected to J241 pin 4 for an open circuit, which would interrupt the signal path between the two boards. If voltage is confirmed to be present at J241 pin 4 but the error persists, the touch key chip or related circuitry on the Main Logic Board is the likely failure point, requiring board replacement. Conversely, if no voltage is detected at RPSM connector J17 pin 9, the fault lies within the Main RPSM Board itself, which is responsible for generating and sending the 60 Hz square wave signal.

Common causes include a broken or intermittently open wire in the harness between the RPSM Board and the Logic Board, a failed RPSM Board that is no longer generating the reference signal, or a failed Main Logic Board where the touch key chip is not processing an otherwise healthy signal. Proper diagnosis requires a multimeter to confirm voltage presence at the specific connector pins before replacing any components.

Source: manufacturer service documentation.

Common causes of F780

  1. 01

    Open circuit in wiring harness at J241 pin 4

    Wiring / connection

    A broken, loose, or corroded wire in the harness leading to connector J241 pin 4 can interrupt the 60 Hz signal before it reaches the touch key chip. Inspect the harness carefully for damaged insulation, broken conductors, or poor connector seating.

  2. 02

    Failed Main RPSM Board

    Part replacement

    If no voltage is present at RPSM connector J17 pin 9, the RPSM Board has stopped generating the required 60 Hz square wave signal. In this case, the RPSM Board itself needs to be replaced.

  3. 03

    Failed Main Logic Board

    Part replacement

    If voltage is confirmed present at J241 pin 4 but the F780 error remains, the touch key chip or associated circuitry on the Main Logic Board is not processing the signal correctly. Replacement of the Main Logic Board is required.

  4. 04

    Loose or improperly seated connector

    Wiring / connection

    A connector at J241 or J17 that is not fully seated can cause an intermittent or complete loss of the signal without an obvious wire break. Disconnecting and firmly reseating both connectors is a simple first check.

See the test procedure for each cause

Frequently asked questions about F780

What does F780 mean on a GE range?
The F780 code means the 60 Hz square wave signal is not reaching the touch key chip on the Main Logic Board. This signal is generated by the Main RPSM Board and travels through the wiring harness to the Logic Board. Without it, the touch control interface cannot operate. The fault can be caused by a wiring issue, a failed RPSM Board, or a failed Main Logic Board.
Can I fix the F780 error myself without replacing parts?
In some cases, yes. Start by inspecting the wiring harness connected to J241 pin 4 for any visible damage, breaks, or loose connections, and check that all connectors are firmly seated. If the harness and connectors appear intact and properly connected, resolving the fault will require replacing either the RPSM Board or the Main Logic Board, which is best handled by someone comfortable working with appliance electronics.
Is it safe to continue using my GE range while F780 is displayed?
The F780 error is related to the control board signal path and touch interface. Until the fault is resolved, the touch controls may not function reliably or at all. It is advisable to avoid using the range until the issue is diagnosed and repaired to prevent any unintended operation.
How much does it cost to repair a GE range F780 error?
Repair costs depend on which component has failed. If only the wiring harness needs repair or a connector needs reseating, costs are minimal. Replacing the Main RPSM Board or Main Logic Board typically runs anywhere from $150 to $400 or more for parts and labor, depending on your specific model and local service rates.
Will resetting the range clear the F780 error code?
A power reset, done by unplugging the range or tripping its circuit breaker for a few minutes, may temporarily clear the F780 code. However, if the underlying cause such as an open harness, failed RPSM Board, or failed Logic Board is not corrected, the error will return. A reset alone is not a fix for this fault.

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