Here are some things you can try:

1. Check the thermostat: Make sure the thermostat is set to "cool" and the temperature is set lower than the current room temperature. If the thermostat is not working properly, it could be causing the air conditioner to malfunction.

2. Check the air filter: A dirty air filter can cause your air conditioner to work harder than it should and can even cause it to freeze up. Make sure the air filter is clean and replace it if necessary.

3. Check the power source: Ensure the air conditioner is plugged in and that the circuit breaker has not tripped. If the circuit breaker has tripped, reset it and try turning the air conditioner back on.

4. Check the condenser unit: The condenser unit is the outdoor component of your air conditioner. Make sure it is free of debris, such as leaves or grass clippings, and that it is not blocked by anything. If the condenser unit is dirty, it can prevent the air conditioner from working efficiently.

5. Check for refrigerant leaks: Low refrigerant levels can cause your air conditioner to blow warm air. If you suspect a refrigerant leak, contact a professional technician to repair it.

If none of these steps resolve the issue, it's best to contact a professional technician to diagnose and repair the problem. Air conditioners can be complex systems, and attempting repairs without proper knowledge or training can be dangerous and cause further damage to the unit.