My 550 is about 12 years old and when the weather gets warm and humid, frost starts to build up on the inside of the refrigerator on the back side behind the veggie drawer (left side). The temp starts to climb up, but, still maintains temp around 40 to 43F. I have checked the door seals and they appears to be okay, but, since this only happens when the humidity increases in the home, maybe the door seals needs to be replaced? I vacuum clean the condenser coil, fan & blade, compressors, and all the parts in the area equipment area twice a year. Do you have any suggestions on the cause? Also, where can a person get a copy of the service manual for this unit?
I had the same problem. It is NOT freon. Got to the point that ice would build up every few days. Talked to Subzero, they said insulation is breaking down between freezer and refrigerator (my unit is 21 years old and otherwise great). I ordered a part from them for $150 that you install in the drain tube that keeps it thawed. My husband and I were able to replace it ourselves. It was time-consuming, but has keep us ice-free for several months. Cheap fix to keep unit around without replacing. Read direction carefully. You have to remove all shelves from the inside the refrigerator, covers, to expose the coils, and have access to wiring from thermostat, light, etc. They give you all necessary parts including wiring harnesses, etc. Everything can be done inside the food area of the refrigerator. Be patient. It will all come together and was money and time well spent.
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Lets go over the way a sealed system works. There is a highj side and a low side. The low side is the side that passes through the evaporator coils inside the machine. Most times on the freezer side only, but sub zero has independent sealed systems for each side. Once it goes throug the evaporator its then condensed into a liquid state, the high side. This is also the hot side. Well, lower pressures in the low side would logically mean lower temperatures. So for the refridgerator not to freeze more freon is used on it to keep the low side pressure higher than normal, giving the cooling effect verses freezing. So, and here is the bad part, if you are seeing ice build up in the refridgerator side you have a freon leak some where allowing the pressure to be less than required to keep it above freezing. Call a service technician and depending on how the model, sub zero warranty is parts and labor covered for the first 6, and only parts from the 6-12 year.
Hello Teresa, I'm going to address the main issue and that is the frost ball in the refrig. That is due to a leak of some of the refrigerant having leaked out causing the frost ball.A company could come out and recharge the refrigerant and that would work for a while till it leaked again. What it takes to fix it properly is to replce the coil in the refrig. then recharge the refrigerant. That typically cost around $1,200.00 but will stop it from leaking ,and avoid paying $200 to have it recharged every year or less.
check the evaporator fan and condensor fan. condensor coil clean. compressor warm.how much frost build up . if frost build block air way, i am sure the problem is heatelement or defrost thermostat. good luck.if the compressor not work . need to check the relay
Just frost or a puddle? If it's a puddle cause by melting frost with no where to go then you had my problem. A clogged drain. First defrost the drain, a hair dryer works well, blow or snake it out then install the factory drain heater fix. Plugs right in and works like a charm. I've had my sub zero 550 for more years than I can remember. I'd buy another one in a minute. Good luck!
sub zero are vey expensive, and sometimes tough to diagnos, but judging by your description, i would inspect your door seal, make sure it is closing and former a good seal all the way around
the best way to handle this, is to turn it off for the day, and let it defrost for 24 hours,
No, it's not normal for it to be over flowing. Check to make sure you have the temps set correctly. Timer/electronic control on these units have been known to "run" too long, causing the evap to build up too much frost before going into defrost mode. Check to make surre to that you don't have signs of "moisture" around the doors, if you do then you have a door gasket leaking air into the frig or freezer causing excessive moisture within the evap coils.
Right hand side wall in the freezer - take a look- any frozen water or moisture? Need check a drain line, usually defrost heater inside the freezer wall getting bad and draining water just freezing inside of it.
The solution posted previously is TOTALLY WRONG. A Sub Zero ref doesn't have a heating element in the fresh food section. Only in the Frozen food section. It has 2 totally separate systems for each section. 2 Compressors and 2 evaporators. They share a condenser. If you are having ice build up in the refrigerator then the problem you are having is a refrigerant leak in the fresh food evaporator. You need to have a certified tech come out and replace the evaporator in your refrigerator section of your Sub Zero. Not sure what you are asking about the thermostat.