You may have a tripped circuit breaker.
Recommended Action: Check your home circuit breaker box and reset circuit breaker.
Your thermostat/control may be off or set incorrectly.
Recommended Action: Check to make sure your thermostat/control is on and set to cool. Reset to your desired temperature.
Your indoor unit is running but the outdoor unit is not.
Recommended Action: Air coming through your vent will be warm. Check temperature setting on thermostat/control. If no change, contact your local Trane Comfort Specialist. In the meantime, try turning off your thermostat/control for 1 to 3 hours to see if it will reset itself.