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Scotsman SCC50P icemaker not harvesting properly


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7 replies to this topic

#1 docbrock

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Posted 25 March 2012 - 07:51 PM

I have a Scotsman SCC50P ice machine which is just over 1.5 years old. Recently it has begun freezing up at the evaporative plate into on large clump of ice. I thought it might be the harvest time was to short and the ice was not given enough time to drop so I increased the harvest time as per the owners manual instructions. This seem to help initially (for roughly a day) but it then began freezing up again. I have tried different combination of cube size and harvest time adjustments including the factory default settings but usually after a few cycles it freezes up again.

I though the problem might be scale buildup on the evaporative plate causing the ice to stick during harvest but despite two cycles of descaling with Scotsman descaler still no luck.

If I perform a manual harvest cycle it does work and dispense the ice but once I switch it back to automatic it fails to harvest properly.

I suspect the machine is failing to complete or initiate the harvest cycle prior to beginning another ice production cycle, hence the ice builds up until finally it's one large block of ice. Is there a common part that can cause this type of problem?

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#2 RegUS_PatOff

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Posted 25 March 2012 - 08:46 PM

... freezing up at the evaporative plate into on large clump of ice.

can you post a picture somewhere ?
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#3 docbrock

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Posted 25 March 2012 - 09:06 PM

I will turn it back on and once the block of ice forms I will try to get a picture of it. I can tell you it looks basically like a large flat rectangular ice block, which form over the surface of the evaporative ice tray. When remove from the tray and turn over it is studded with the shape of the ice cubes. I think what is happening is that the cubes are forming normally but not releasing so after many cycles they built up until they all coalesce into one frozen unit.

#4 docbrock

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Posted 25 March 2012 - 11:30 PM

Here is a picture showing the ice buildup after running a few hours. It did discharge some ice during the beginnig but quickly began to buildup and coalesce. You can see how the individual ice cubes are starting to over flow from the chambers and combine with the adjacent cubes. If I force a manual harvest at this stage it will purge the cubes. If I let it continue it will build up to the point that even a manual harvest won't work and I have to shut it off and wait until the ice slowing melts.

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#5 RegUS_PatOff

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Posted 26 March 2012 - 05:18 AM

for service manuals and other perks, become an Appentice
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#6 jumptrout

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Posted 26 March 2012 - 06:53 AM

Is this machine entering harvest but failing to drop or is it not entering harvest?

#7 docbrock

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Posted 26 March 2012 - 07:12 AM

That's a good question. I assumed it was entering a harvest cycle because after I free the evaporator of the frozen block of ice it usually works for a few cycles before freezing up again. I think it may be the hot gas valve not opening. I will check the indicator lights on the controller during a cycle later today. Is there an easy way to test this theory? Would a nonfunctioning hot gas valve result in the kind of behavior I am seeing?

#8 jumptrout

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Posted 26 March 2012 - 08:12 AM

Yes it would.
The valve coukld be sticking or a weak pickup coil.
As you said....check for power at the valve.




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