Why is my inverter/charger displaying error code E11?

Why does my inverter read E11?

An E11 error indicates a possible over-temperature event on the AC transfer relay. Reduce the loads connected to the AC outlet of the unit. Check that the ventilation grille is not blocked. Check for ambient temperature and move the unit to a cooler location whenever possible. If issue persists, contact Newcastle Technical Support. http://www.newcastlesys.com/submit-trouble-ticket