How do I replace a sub zero 642 icemaker unit

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: 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: Sub zero 532 ice maker

When my repair tech came out, he showed me that the fill tube sometimes retracts toward the rear of the freezer. He simply pulled it forward with a pair of needle nose pliers until it rested in the delivery reservoir. This placement allows the detector to know when the tray is full and shut off; thus not overfilling the freezing tray and/or splashing additional water onto the freezer wall and into the ice cube drawer.

SOURCE: Ice maker in Sub Zero 642

Call the factory at 800-222-7820 for the manual. It souns like you are missing one or two screws. Pull the ice tray out and lift it up about an inch and it should release. Take a look at the ice maker and there are two supports that both need to have screws on them. There is also a third underneath on some models. Insert the screws and you should be fine.

SOURCE: sub zero fridge model 561 not making ice

Thanks to everyone for the help.We did get it moving and working finally. My husband took the ice drawer out. Reached up to where the ice drops out and poked around a bit. He said he didn't move anything but I heard a piece of ice move. We then shut the power off at the breaker switch, waited 10 seconds or so then turned back on. An hour or so later, we heard ice drop and it's still making ice. What a relief. I
could tell there had been a power failure as the clocks all needed resetting. So as someone suggested, we just had to reboot the thing.
We tried everything after reading 50 plus pages of questions and answers and finally got it. Thanks so much!