Janani cool care

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

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