Customer Questions and Answers for Ice Maker by Whirlpool

Hello Bob, The only thing that will cause hollow cubes is an insufficient water fill. This can be caused by insufficient water pressure to the unit from the water supply, a crimped water line, or a failing water inlet valve. If you check and find good water pressure to the valve, then the valve will require replacement to restore normal operation. The water valve on this unit has been changed during manufacture so the one you need will be determined by the first two digits of the serial number. If your serial number begins with 12 or lower, you will need to order WP67005154. If your units' serial number begins with 13 or higher, you will need to order par number WP67006531.