Check if condenser fan motor is running and condenser unit - it might be full of dust and lint - clean it! It is dangerous for both compressors if that fan motor has stopped working! These parts located on top behind that alluminum grill, on right hand side. Sub Zero refrigeration condenser cleaning - Read instructions here:
http://www.subzerolosangeles.com/how-to-clean-a-condenser-on-a-sub-zero-refrigerator/
Sub Zero refrigerator repair service and parts in Los Angeles
These are classic symptoms of 1. dirty condenser or 2. a malfunctioning condenser fan. Please check these 2 things by opening the louvered panel. The condenser is the part that looks like a small radiator. If you haven't cleaned it recently it is likely rather dirty. These should be cleaned every month or two to maintain proper operation. If your problem persists after this is clean, you will want to make sure the fan mounted right behind this is functioning.
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