When the starter battery of the Couple Condo is not working, you can try the following:
- Make sure the camper batteries are charged
- Set the parking brake and press the button "BATT BOOST" on the dashboard
- Turn the key and start the engine for no longer than 30 seconds
- Release the emergency start button as soon as the engine starts running
- Drive, to re-charge the battery
Watch this video for a more detailed explanation: