other is a refrigerant leak. you will not be able to use your unit until you get the problem fixed so you should call a good company but worry not as it will not cost you too much.
are you noticing water drops on your machine or making it is dripping water? if it is then there is a certain problem in the air conditioner and it could be something severe like a refrigerant leak or it could also be a drain pipe that is blocked.
if your air conditioner is making noises that is does not usually make then it needs to be looked at. since an air conditioner is supposed 