Kubota generator shuts down and displays E06 after running under load for some time.

Safety first: Open the generator main breaker and building transfer switch. Confirm no live voltage at the load terminals before inspection.

• Check load size: Review the total connected kW and starting currents of major appliances. Ensure they do not exceed the Kubota generator's continuous and standby ratings.
• Inspect load circuits: Look for obvious shorts or damaged cables between the generator and transfer switch. Repair any burned or melted insulation.
• Test main breaker: Manually operate the generator main breaker several times. If it feels rough, loose, or fails to latch, it may be defective and should be replaced with the correct Kubota-specified breaker.
• Isolate loads: Reconnect loads one at a time while monitoring current draw with a clamp meter. Identify any circuit that causes immediate overcurrent and troubleshoot that circuit separately.
• Controller sensing: If measured current is normal but E06 persists, the current transformer (CT) or wiring to the controller may be faulty. Inspect CTs around the output conductors for cracks or loose connections and replace if necessary.