SOURCE: Freezer not maintaining proper temp.
A few possibilities here. The fan motor in the freezer could be stalling, or the drawer could be sticking open, or you could be seeing it in the defrost cycle. the freezer on these sub-zeros have a defrost cycle that is electronically controlled, so it should not warm up that much (or hardly at all) I would say you ought to get a servicer out there right away, and see if you can track any sort of cycle or particular time it happens before they come. the sub zero service phone # is on the door frame on the upper left corner inside the freezer. If there are no servicers in your area, sub zero will do whatever is neccesary to remedy the problem. I work for an authorized sub zero servicer and they go to great lengths to keep their customers happy. Good luck!
SOURCE: Kenmore Upright Freezer Model 253.9239780 Temp alarm, Temp rising slowly
you have a refrigeration issue partner let her go 16 yrs. is good service you can replace it for 3 to 5 hundred the repair will be that IF you can find someone with the r-12. don't go for a top it off and go deal the food you lose is to expensive for that to be economical.
SOURCE: Sub-Zero temperture fluctuation
Just posted this elsewhere and it sounds like the same problem:
As you probably know, the recommended temperature range is between 35-45 F so if your control will not allow you to set this, the sensor or associated regulator has failed.
This seems to be an issue with Sub-Zero.
SOURCE: Kenmore Elite bottom freezer refridgerator
I just went through this with my refridgerator and actually posted one of the questions. Here is what I found ........
In the freezer compartment behind the panel there is an evaporator fan which pulls cold air from the freezer and pushes it up into the refrridgerator compartment. If the fan is not working it is one of three things.. 1) there is so much frost in the fan area the fan blade is stopped and cannot push the cold air into the refridgerator compartment or the air channel is blocked. 2) there is no electricity going to the fan (usually tied to the door switch of the refirdgerator compartment, and 3) the motor is dead and will have to be replaced.
Solution to #1 - defrost but there is another problem in the "frost-free" part of the system which must be addressed or the frost will return and it will happen again in the future.
Solution #2 - check to see there is power to the fan. (most are 110VAC but some are 100VDC. Use a meter and check)
Solution #3 - If there is power, the motor is dead. Replace the motor. Be aware that AC and DC motors are different and replace per manufacture's specifications.
SOURCE: Sub Zero 680 freezer temperature problem
check the condencer on top .open the doors look up you should see three screws take them out and pull down the panel and clean the condencer if its clean CALL repair guy!
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