Controller displays EXER FAIL or EXERCISE FAILED after a scheduled exercise period.

Safety first: Ensure the area is clear and the generator is safe to start manually.

• Review event log: Use the controller menu to view the last fault that occurred during exercise (e.g., OC, LOP). Address that underlying issue first.
• Check battery and charger: Confirm the battery is fully charged and the charger is operating correctly.
• Verify fuel and valves: Ensure gas valves are open and fuel is available at the time the exercise is scheduled.
• Exercise settings: Enter the controller setup and verify the exercise day, time, and duration are correctly programmed per the Briggs & Stratton manual.
• Manual test: Run a manual exercise cycle to confirm reliable starting and running. The EXER fault should clear after a successful exercise.