Low water pressure to ice maker
	
	
		I have an ice maker that is not working correctly: it produces hollow ice cubes and makes whining and clicking sounds almost continuously.  Occasionally I have to dig the chucks out of the dispenser so that it can make new ice.  I believe it is due to low water pressure as the water dispenser does not dispense properly either--and never has since we brought the refrigerator. 
We have a RO system for drinking water under our sink and our own well (not city water).  
Does anyone know a quick fix for increasing the water pressure to the refrigerator?   And, if I cannot fix it myself, who should I call, a plumber or the refrigerator repair man (it's a Maytag). 
Thanks for your help.