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First make sure that the thermostat is set lower than the actual room temperature. The selector switch must be on "cool". If the thermostat is programmable, be certain it has fresh batteries.
Check for power by moving the fan switch from "auto" to "on". If the blower runs, there is power. If nothing happens, a control is burned out or power is disconnected. If the system uses a furnace for heat, check that the emergency switch is on. If you are familiar with the fuse or circuit breaker panel, check for blown fuses or tripped breakers. Correct the problem one time only. If it repeats, call for service
With the selector switch on cool and the fan switch on auto, move the thermostat well below room temp. If the blower runs but the condenser(outdoor unit) does not, check the circuit breaker panel. If the breaker is on, examine the condenser. Some have a high pressure cut out. It is a button sticking out of the cabinet, usually near the refrigerant lines. Push it in as far as it will go to reset it.
If the unit is in the basement and has a condensate pump, the control wire for the condenser might be wired through a safety switch on the pump. Check to see if the pump is plugged in and operable.
If the unit is in the attic, there could be a float switch in the air handler or in the safety pan that will shut the condenser off if the drain is clogged. Water around the unit is evidence of trouble. call for service.
HVAC systems are high powered units that use both gas and electric, If you are not comfortable with trouble shooting your system or have signs of an obvious issue, call for an Emergency Appointment - Stay Safe!