My sub-zero 245 has a build up of frost behind the ice maker bucket, the vent has about one inch build up of frost . The ice cubes are almost clear?

SOURCE: My subZero Model 245 Icemaker stopped making ice

Ice maker, I don't know where you can find the manual but I'll give you a few ideas of what to look for. First make sure that the inlet tube is not frozen over. Next, look at the center gear on the module and see if the clips in the center are not broken. If so you will have to replace the module. The ejector blades should be at the 2:00 position when home. If you get a jumper wire and jump T to H, this will by pass the bi-metal and run a cycle. The ice maker should fill at around the 12:00 position. Test points L & N will verify if you have 120v to the ice-maker. Test points L & H will test the resistance of the heater, 72 ohms. plus or minus 10%. Hope this gets you going, Catriver...post back.

SOURCE: How to fix iced up and jammed ice maker for Sub Zero 532

There should be a screw or two that if removed will allow the unit to pull free. The rest you have seen...Take it out and let it thaw then replace it and see if it works if not then get a new one....

SOURCE: ICE MAKER SUB ZERO REFIGERATOR

Check water turned on. check ice button switch turned on in fridge. remove juice storage, ice container in freezer, check ice bucket full white plastic flapper to make sure not stuck on a white peg at top. flapper must hang down and be freely movable to signal ice maker to keep busy. If up high will turn off ice maker. Lots of other parts especially heater circuits involved also: fill tube supply heater not working then frozen supply line then no ice. Look for wiring diagram in ziplock behind compressor grille. can order parts at repairclinic.com. logical design, layout, easy to get to sensors, heaters. makes sense if look at it long enough.

SOURCE: in door water and ice cube not working

Water dispenser is a simple touch switch in door energizing a solenoid water valve behind ventilation grate above refrigerator. Water tube runs down into and ends at ice dispenser chute. Should hear solenoid click at top of fridge when activate water touch switch. Can unhook discharge side of solenoid valve temporarily to prove water output. If water dispenser tube acts blocked it could be frozen where it ends-look up the hole at the bottom of refrigerator control buttons.
Ice maker is totally different system. No clicking when push ice button but ice in bulk tray may mean the simplest of malfunctions: Ice bin not pushed in the last half inch if ice auger not lined up with drive pegs. There are hidden switches behind ice bin that need to be engaged or nothing will happen in the ice maker: no auger noise, no clicking, no new ice making. Ice bin will be flush with sheet metal if it is in the right spot. Also plastic juice rack won't hang properly if ice bin not pushed in all the way.

SOURCE: water leaks into ice maker bin

2 possible causes. 1) tehe tube is not inside of the ice maker. 2)the ice maker has acrack. better to call a tech