Originally Posted by bobzam
If it is a programble one you might need to change the battary and then reset it. Should be a button on it for reset. Also check your fiter and see if it needs changing or the conensate line could be plug. This is the drain pipe that drain outside.
If you have an LCD display on your thermostat and the display is faded, change the battery. Some units are line voltage(110 volts) and should not be touched by the inexperienced.
If this is a high rise building with numerous tenants, there should be a service component for repairs regardless of where the owner is.
If your's is the only unit that is effected, it's probably the thermostat and the repair guys should be able to deal with it in a timely manner.
If it's the central A/C unit, a repair company will need to be brought in. If the Super is the liason, contact him.