Janani cool care

This is more than likely caused by a lack of power but could indicate other problems too..

Hitachi AC Thermostat not set properly
Hitachi AC Emergency switch or shut-off switch turned off
Hitachi AC Blown fuse in panel box
Hitachi AC Circuit breaker tripped or off
Hitachi AC Outdoor disconnect turned off
Hitachi AC Off on outdoor reset button
Hitachi AC Unit locked out (reset by turning off then turning back on)