- Model Number
- More than 10 years
I have a Sub-Zero 550 from 1990 that I inherited with a house purchase that was not getting cold. I found the condenser motor fan was broken off and the motor was all gunked up so it would not spin. I replaced it with a working parted out oem Sub-zero 4200740 with the same specifications that were in the original (2.3W 0.15A 115V 1300RPM). I also steam cleaned all the dust and gunk from all the tubing and between the fins. I replaced all the dried out / cracked plumbers putty and removed and replaced all the silicone waterproofing. I set the unit to the recommended temp settings of 4 and 6 to target 0 degrees for the freezer and 38 degrees for the fridge. After running overnight the problem I am having is the compressors and condenser fan continue to run nonstop but the freezer is at -18 degrees and the refrigerator is at 30 degrees. I tried lowering the temp settings to 3 and 5 but that did not help as the temperature changed to 4 degrees for freezer and 32 degrees for fridge but still did not cause the compressors or condenser fan to kick off. The freezer compressors is about 121 degrees and the fridge compressor is about 104 degrees. Door are sealing tightly all the way around and it completely level front to back and side to side. Circulation is good as grill cover is warm on compressor side but cool on the condenser side. The only way I could get compressors to stop is turning dials it off positions but the fan continues to run and obviously the fridge and freezer stop cooling. Any suggestions on what I should be looking at?