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If your trying to remove the grill plate thats located at the top of the machine what you need to do is open both the freezer and the refridgerator doors and look up. There are three vertical phillips head screws that you'll need to remove first. After that you'll be able to pull the grate forward and remove the springs, one on each side that keeps tension on the grate. Once those are removed, the grate will be easy to take off.
The condenser is the coil on the outside of the unit that rejects the heat. most Sub zeros I have serviced had top mounted compressors and condenser coils .just find the compressor and the coil. Be careful of the fan. they just want you to check on it
On models with 2 compressors the condenser fan motor runs 24/7. It must since the compressors run randomly and that motor must be on since it handles both units.
Fan noise is subjective. It itself makes little noise but the blade does. If for example the blade was changed from the nylon style to a metal blade (good idea) then it would be somewhat louder.
If the noise is not objectionable then I would use it as is.
At the top or bottom of your unit you have a removable panel that covers your compressor and condenser, you should hear a fan, that is your condenser fan, those coils need to be cleaned with a vacuum or dryer brush
The condenser coil is located behind the cover on top of the two doors and when you take it off you see the coils that look like a radiator (fins and copper pipes) ,turn of the refrigerator and with a brush and a vacuum clean the coil very carefully and don't push to hard against the fins.
Your problem might be serious enough to warrant a repairman's visit. But this was my experience: An official Sub Zero repair company in NYC told me this: If
the "vacumm condenser" light keeps flashing after you've opened and
cleaned the condenser grill, then either pull out the plug for the Sub Zero refrigerator or turn
off the circuit breaker (or fuse) in your house that leads to it, wait
for some minutes and then turn back on. It is NOT enough to turn off
the unit using its own internal on-off switch - it has to be totally
disconnected from the AC. I did so, waited 15 minutes, turned back on,
and it worked!! I had vacuumed the condenser grill twice but the
"vacuum condenser" light kept flashing AND the refrig would go bonkers
if set below 38. Now the flashing warning is off and it's down to 35.