I seem to be constantly filling the water reservoir to "assist" with efficiency of use. I find I get an airlock in the water chamber and can't add water anymore Is the water chamber an add thing or a meter to let me know when to empty the unit due to condenser evap. Got me stumped. I also have the water icon (just to the right of the airconditioning icon on all the time) I lost the manual 13 minutes after receiving the unit ie recycle bin :( Please help