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Error code reference

GE Range Error Code F620

LIN communication error to/from RPSM Aux Board (when equipped).

GE codesGE range codes

LIN communication 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 F620 means on a GE range

The F620 error code on a GE range indicates a LIN (Local Interconnect Network) communication failure between the main control board and the RPSM Auxiliary Board. LIN is a serial communication protocol used in some GE range models to allow the main board to exchange data and commands with secondary control modules. The RPSM Aux Board typically handles supplemental relay or power switching functions, and when the main board cannot establish or maintain a valid LIN signal to or from this module, the F620 fault is triggered.

This communication breakdown can result from a failed Aux Board, a wiring harness issue between the two boards, or a fault in the main board's LIN communication circuit. Because the error specifically points to the LIN bus, loose connectors, damaged wiring, or corrosion at the harness terminals are all potential contributors. The diagnostic guidance emphasizes that if the main board's relays are still functioning correctly, the problem is most likely isolated to the Aux Board itself rather than the main board.

It is worth noting that this error only applies to units that are equipped with the RPSM Aux Board. On models that do not include this board, the F620 code would not appear under normal operating conditions. When diagnosing this fault, technicians should first verify the wiring harness integrity between the two boards before committing to a parts replacement, though the Aux Board is the primary suspect when the rest of the control system is operating normally.

Source: manufacturer service documentation.

Common causes of F620

  1. 01

    Failed RPSM Aux Board

    Part replacement

    The Aux Board itself is the most likely cause, particularly when the main board's relays continue to function normally. Internal component failure on the Aux Board can prevent it from communicating over the LIN bus entirely.

  2. 02

    Loose or disconnected wiring harness

    Wiring / connection

    The connector linking the main board to the Aux Board may have come loose or partially disconnected. Inspecting and reseating the harness connector at both ends is an important first step before replacing components.

  3. 03

    Damaged or corroded wiring between boards

    Part replacement

    Physical damage, pinching, or corrosion on the LIN communication wiring between the main board and the Aux Board can interrupt the signal. Visually inspect the harness for burnt insulation, broken wires, or terminal corrosion.

  4. 04

    Main board LIN circuit failure

    Part replacement

    If the Aux Board and wiring check out as intact and functional, the main board's LIN communication circuitry may itself be at fault. This is a less common cause and is typically considered after the Aux Board has been ruled out.

See the test procedure for each cause

Frequently asked questions about F620

What does F620 mean on a GE range?
F620 indicates a LIN communication error between the main control board and the RPSM Auxiliary Board on equipped GE range models. LIN is a serial data protocol that allows these two boards to communicate. When the signal is lost or corrupted, the range logs the F620 fault code. This error only appears on models that include the RPSM Aux Board.
Will resetting my GE range clear the F620 error?
A reset by cutting power to the range for a few minutes may temporarily clear the F620 code, but it is unlikely to resolve the underlying problem. If the Aux Board or wiring has a hardware fault, the error will return once power is restored and the control system attempts to re-establish LIN communication. A proper diagnosis is needed to prevent the code from recurring.
Is it safe to use my GE range while F620 is displayed?
Because the F620 fault is tied to a secondary auxiliary board rather than core safety components, the main burners and oven functions may still operate if the main board relays are intact. However, operating any appliance with an active control fault is not recommended, as the full extent of affected functions may not be immediately obvious. It is best to have the issue diagnosed before continued use.
How do I fix the F620 error on my GE range?
Start by inspecting the wiring harness between the main control board and the RPSM Aux Board for loose connectors, corrosion, or physical damage. Reseat all connectors and check for continuity in the LIN communication wires. If the wiring checks out and the main board relays are still functioning, replacing the RPSM Aux Board is the recommended next step. If the error persists after replacing the Aux Board, the main board may also need to be evaluated.
How much does it cost to repair a GE range F620 error?
Repair costs vary depending on which component needs to be replaced. An RPSM Aux Board typically costs in the range of $50 to $150 for the part alone, while a main control board can run $100 to $300 or more. Adding professional labor, total repair costs commonly fall between $150 and $450 depending on the specific model and service rates in your area.

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