Kubota standby generator will not switch to AUTO mode or does not start automatically during a power outage, but starts manually.

Safety first: Work on control wiring only with both utility and generator sources isolated and locked out.

• Check controller mode: Verify the Kubota controller is set to AUTO and that no lockout or maintenance mode is active.
• Simulate power loss: With a qualified electrician, simulate a utility failure at the ATS and observe whether the generator receives a start signal (check start input at controller).
• Inspect control wiring: Verify continuity of the start/stop signal wires between the ATS and generator controller. Repair any breaks or loose terminals.
• Utility sensing: Confirm that the controller correctly detects utility voltage on its sensing inputs. If not, check fuses and wiring from the utility source.
• Programming: Review auto-start parameters in the controller (start delay, inhibit conditions) and adjust per Kubota guidelines.