GE Range Error Code F620

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.

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.

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.

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.

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.