Check thermostat and power
Verify cooling mode, the setpoint, and whether the thermostat display is operating. Check the relevant breaker once; repeated trips are a reason to stop resetting and call for service.
Check accessible basics
A severely clogged filter or a condensate safety switch can sometimes contribute to shutdown behavior. Do not bypass switches or open electrical panels.
Call when the system stays off
If normal settings and a single power check do not restore operation, professional diagnosis is the safer next step.
Safety note: If you smell gas, see smoke or fire, suspect carbon monoxide, or believe there is an immediate safety danger, leave the area as appropriate and contact the relevant emergency or utility service. Do not treat an active safety emergency as a routine HVAC appointment.