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Ice Cubes won't drop out

I've got a Manitowoc Series 150 Icemaker, and the last problem I have to fix on it is achieving the proper balance so that it's far enough back that the water coats the ice tray enough to get ice cubes forming (and doesn't drip out over the front of the trough), and far enough forward so that the ice cubes actually drop out of the top and down into the bin.

No matter how much fiddling I do, during the harvest cycle the ice cubes still seems to drop part-way out of the tray, but get stuck on the bottom and the whole sheet of cubes just leans out onto the top of the water curtain, but isn't at the right angle to swivel the plate out of the way in order to let the cubes drop out. (like this ---> |// )Then a new cycle starts, water cascades over the stuck sheet of cubes, and pours down into the collection bin - melting any ice successfully formed. :(

So, I use up a lot of electricity and still get no ice.
I've fixed EVERTHING else on this machine, just not this.
Very frustrating.

So then, something strange happened.
I was doing P/M - cleaning the ice machine, removing scale, and cleaning the ice tray (nickel plating is a little spotty in a few places).

After I rinsed out the machine and tried to start it up, at first, the water pump wouldn't run in the freeze cycle, and then one it finally started up, it would shut off after a few seconds (CLICK - sounded like the harvest cycle started.) The next day - it's freezing ice again, but the cubes are still not dropping. Weird. Could have been something to do with the ice bridge probe...
Happy that it sorta ''fixed itself'' and I can manually drop the ice and at least get SOME - but still troubled that it's not working quite right.

Posted by on

  • creativechem Mar 20, 2009

    Great suggestions, the only issue that could be making a minor
    contribution to the problem is the water curtain hole where the plastic
    pin expands into is cracked -so I fixed that with cyanoacrylate.

    I had a distributor ask his HVAC guy, and they didn't have much to
    suggest except adjusting the ice bridge thickness. I wasn't sure what
    that would accomplish since the whole sheet was releasing, just not
    falling into the bin, but I turned the adjustment screw down 2 full
    turns (!) until the ice started to fall into the bin in a sort of
    haphazard fashion. I levelled the machine as a baseline function test before doing that, but it wasn't working reliably enough. Tilting the machine forward helped to provide
    enough momentum to the falling sheet to have it function pretty
    reliably for the past several weeks.

    I have photos of the Ice tray, showing clear vacuum-release holes, some
    flaking of the plating, and the style water curtain used.

    Not sure how to post / link to those ...
    The grids are secure, and the evaporator is in there solid.

    But thanks for all the thought and helpful input. It might all help me get this dinosaur up and running the NEXT time it fails!



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The thickness probe should be approximatly 1/4 inch off of the evaporator.Sounds like you might have loose grids on the evaporator.turn the unit off and remove the curtain.use a flash light and inspect the grids.There should not be space in between the joints,if there is the ice will freeze behind the grids and not properly release when in harvest. Also gently pull at the grids,if they pull towards you or wiggle then they are separating. I have removed one of the grids and had the unit continue to run for sometime until the evaporator could be replaced.The plating being spotty causes release issues as well.Finally check the level of the machine,front to back and side to side.Not being level will also cause release problems

Posted on Mar 12, 2009

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Make sure the fan cycling control is working in harvest. low head
pressure in harvest= low temp in harvest.

Posted on Apr 18, 2013


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