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With E.P.A. laws, of you do not have the equipment, I would donate the unit for a great tax break. Any unit that is over 10 years old, always replace to a higher energy effiecient unit. It will pay for it self in a few years, just off the money you saved. If the unit is only a few years old, the new compressor will run $120-$175, plus a coupple hundred for labor.
I do not believe in vacuuming the coil. Due to the thickness of the coil, it should be blown out. If You do not have an air tank and hose, a good shop vac with a push-pull feature, and a crevice tool is a good substitute.
It's messy and filthy, but is the only correct way.
The light comes on when it senses high discharge temperatures or excessively high compressor running time.
If cleaning fails to resolve the problem, call for service. It may be a refrigerant leak just starting, a serious problem.
Check continuity on door light switch with ohmmeter (turn off power and disconnect wire harness at switch first) Probably a second switch that turns compressor off if door open. my 690 sub zero had a bad light switch that was stuck on initially but now only works if I wiggle it. Can a person buy parts online? Some new subzeros have a fuse panel behind the compressor grill??
Just bought a used 690 and found a nice wiring diagram for a model 630 or something in a nice ziplock pouch behind the compressor grill. Look there for clues.
get into diagnostic mode by pressing and holding either colder key, then pressing on/off. You can use the colder key to scroll through 5 reading labeled fe, re, f, and r look at the re temp. is it higher than 38? if it is you probably have a freon leak in the evaporater refridgerator (call sub zero...they will completely pay for this issue, even past the 5 year warranty) If the temp reads really low (like 10 on re or something) you probably have a bad fan or fan switch in the fridge portion. this unit has seperate compressors and freon for the fridge and freezer..hence the lack of problems in the freezer. hope this helps!