Controller shows E07 and the generator will not crank when a start command is given.

Safety first: Ensure the generator is in OFF mode and cannot auto-start. Wear eye protection when working around batteries.

• Measure battery voltage: Use a multimeter at the battery posts. A healthy fully charged 12 V battery should read about 12.6–12.8 V. If below 12.0 V, the battery is significantly discharged.
• Inspect terminals: Clean any corrosion from battery posts and cable clamps using a wire brush and a baking soda solution. Tighten clamps securely.
• Check battery charger: With AC utility power present, measure DC output from the Kubota battery charger. It should be around 13.4–13.8 V. If there is no output, check the charger's AC supply fuse/breaker and replace the charger if failed.
• Charge or replace battery: Use an external smart charger to fully charge the battery. If the battery fails a load test or is older than 4–5 years, replace it with the correct CCA-rated battery recommended by Kubota.
• Parasitic draw: If the battery repeatedly discharges, measure standby current draw with an ammeter. Excessive draw may indicate a controller or accessory fault that requires further diagnosis.