The E1 error code signals an issue with controls. Not unlikely, the air filter is down and needs to be replaced. Maybe things are less dramatic, and you just need to clear the filter. Finally, it is possible, that it is even simpler: just unplug the unit, wait a couple of minutes and plug it back in.
Second, the error can be caused by loose connections between interior components, as well as lack of communication between the indoor and outdoor units. Not unlikely, the control panel is down. If you have a knack for electronics, you could possibly fix it yourself. If not, use professional help.