Disclaimer, I've never seen one of these, but a quick search in Google offers this advice for the beeping...
Common Causes and Fixes
Low Starting Battery:
Your chassis battery voltage may have dropped below the warning threshold (typically under 11.9V), signaling that it is heavily discharged or failing.
Loose or Corroded Connections: Dirt, corrosion, or loose ring terminals on the house, chassis, or ground wires can interrupt the charging flow and trigger a false or low-voltage alarm.
House Charger Failure: If your shore power converter or solar setup is not actively charging the house bank, the system cannot maintain the starting battery.
I see that it has some indicator lights. Which ones are on?
