Is the water supply line cracked or damaged?
If water appears to be leaking from the back of the refrigerator, make sure that the water line from the household water supply to the refrigerator is not damaged or cracked.
Is the tubing firmly inserted into all fittings/connections?
Check all connections that are accessible, such as the connection at the supply valve and the connection point of the supply tubing onto the back of the refrigerator. Make sure the tubing is firmly inserted into all fittings and that all fittings are tightened.
Is the saddle valve or shut off valve leaking?
Check all connections at supply valve, Saddle Valve or Shut Off Valve style, make sure the tubing is firmly inserted into all fittings and that all fittings are tightened.