Here are some simple things you can do to diagnose an air conditioner problem:
Check the air filter. A dirty air filter can restrict airflow and cause the air conditioner to work harder.
Reset the thermostat. Sometimes a simple reset can fix a problem with the air conditioner.
Check the breaker box. If the breaker for your air conditioner has tripped, reset it.
Listen for strange noises. If you hear strange noises coming from your air conditioner, it could be a sign of a problem.
Look for leaks. If you see any leaks around your air conditioner, it could be a sign of a more serious problem.
If you’ve checked all of these things and you’re still having problems with your air conditioner, you should call a professional to diagnose the problem.