Sub-Zero Refrigerator Leaking Water? What to Check First

Before you call

1. Check the drain pan underneath

   Sub-Zero units route defrost water to a drain pan near the base — a cracked or misaligned pan is one of the most common sources of a puddle underneath, not a refrigerant leak.
2. Look for ice blocking the drain tube

   A frozen or clogged defrost drain backs water up into the unit instead of routing it out — common if a door's been left ajar or a seal is worn.
3. Check the door and drawer seals

   A soft or torn gasket lets humid air in, which condenses and can look like a leak over time — run a hand along the seal for weak spots.
4. Note whether it's water or refrigerant

   A true refrigerant leak has an oily residue and a faint chemical smell near the lines — water leaks don't. This distinction changes the repair completely.
5. Check that the unit is level

   An unlevel column can cause water to run to one side and drip out instead of draining properly — worth a quick level check before assuming a part has failed.

When it's time to call a technician

If you've ruled out an obviously blocked drain or worn seal, or you suspect a refrigerant leak (oily residue, chemical smell), stop troubleshooting and call — a sealed-system issue on a dual-compressor Sub-Zero isn't a DIY repair.