A CUSTOMER OF MINE HAS A 650 SUB ZERO AND IS OVERFLOWING THE DRIP PAN EVERY 2 WEEKS. tHE CONDENSER DOESNT SEEM TO PUT OUT MUCH HEAT AND THE FREEZER COMPRESSOR DOESNT RUN FOR LONG,THERE WAS A SENSOR FAULT ON DIAGNOSTICS SO HAVE REPLACED THE REFRIGERATOR EVAP SENSOR AND JOINED THE CABLES AT CONNECTOR AND LEFT THEM THE LENGTH THEY CAME IN PACKET. THERE DOESNT APPEAR TO BE ANY WATER COMING FROM ANYWHERE ELSE ,LOOKS AS IF THE REFRIGERATOR IS ICING UP TOO MUCH. ANY IDEAS?

SOURCE: leaking sub zero 650

Mine did it. The whole unit was replaced. The floor was messed up and sub zero was litle help. Their insulation gave out.

SOURCE: leaking sub zero 650

I fixed my leaking problem by pulling out the vegetable drawer and checking the condensation drain hose. Sure enough, it was clogged and the condensation had nowhere to go but move out toward the front of the fridge, down the left side and onto the floor. Once that drain hose was cleared (with a bendable straw), no more leak!

SOURCE: Overflowing drip pan under the fridge

for reallybsq
problem could be door seals not sealing completely and hence excessive ice formed on evaporator and excess water when it melts. however, i have found this problem many times with large larder fridges and really found no cure.

for guest.
towards the bottom of the back wall, there is a gulley with a drain hole in the middle. this drain is blocked. clear it with something flexible and make sure water flows away freely

SOURCE: Sub-Zero 550 water dripping on right side of freezer forming ice on draw

I had a similar issue that started about a year ago with my Sub-Zero 550. My freezer gasket actually tore after several times of freezing closed. I thought that a new gasket would solve it, but a second but related problem developed where I was getting alot of condensation under the left side of the unit, with the water dripping onto the floor...eventually staining the hardwood floor in front of the unit.

I traced the problem to a clogged condensation drain pipe in the refrigerator. It is a corrugated pipe that drains a trough behind the crisper drawers. My pipe was clogged with black sludge and frozen down below. The condensation in the fridge would overflow out of the trough and leak below the crisper drawers, down out through the gasket.

To resolve, I used a piece of solid thin wire folded in half and twisted with a small loop at the end to fish out as much sludge as I could. Then squirted hot water into the pipe until it totally unclogged. I believe this will solve the problem without any need for a heater underneath the unit. The 550 worked fine for 4-5 years before this happened.

SOURCE: Sub-Zero 550 water dripping on right side of freezer forming ice on draw

The drain line has been clogged. There is actually a defrost heater kit for that problem if you can get the obstruction out. Did you call factory at 800-222-7820 or a local factory authorized servicer? The drain is accessed by removing the fan shroud and evaporator cover. There are a number of of phillips head screws that hold this in place. Once you have removed the two cover you will see the drain tube on the left side of the unit. I use a hair dryer to start defrosting the tube. If you have another freezer in the house it is easier just to turn the freeezer section off for a day or so. I use nitrogen to blow the line out from the bottom once everything has defrosted. Test for water flow, then put unit back together. Call the factory at the number above for the heater kit part number and they will also give you the local authorized parts supplier. The locator web address is http://subzero.com/locator/locator.aspx?type=0&zip=Zip%20Code