Question about GE Monogram ZDI15C Automatic Icemaker

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Black specks in the ice

I just cleaned the unit, according to the directions. Had to do it twice. Now there are small black specks in the ice. Any suggestions?

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I have city water and I have this SAME problem. My question is if it's what the other guy suggests it is; then why would why would I be having black specks in my ice then? And its only one ice cube at that, It's like the section where the certain cube is coming from has chipped paint from it. There is no pump of any sort in our house IE: sump pumps. Nor are there any kinds of drillings or any water work being performed at this time by the city in the neighborhood either. I thought it might just be plain old calcium deposits. But I haven't been able to find any one who knows anything about this stuff to tell me if I am going about it in the correct way. I certainly don't want to pay mega-bucks for someone to come out to the house and swab the inside of the ice maker with LCR, then tell me to let it run about three to four days without digesting any of the ice cubes or we could get very sick so that and then charge me $75.00 you know what I mean?

Posted on May 28, 2010

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I have the same problem and haven't solved it yet. I have a brand new water heater. A retired carpenter/contractor (47 years) posted this, saying that he knew what it was right away. He said it was the deep well pump. (I do have a well). The seal in it had broke and was leaking oil into the water. Every time the pump would come on it would stir up the tiny bit of oil, enough to make it look like a barrel. I haven't had mine checked yet, but it certainly makes sense to me.

Posted on Mar 09, 2009

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The black specks can be from several sources but these are the 3 most common:

1. The internal and back of the fridge plastic tubing used to route the water from the water valve to the icemaker

a. If water sat in the tubing for months and there was decay of the water quality then the black gunk can build up in the plastic lines. You can clean the ice maker supply line on the back of the unit with bleached water after you gently pull the upper part of the hose from the fitting and unhook the lower part of the plastic hose from the water valve. Wear rubber gloves and be prepaired for bleached water drips. Just make sure you purge the line with fresh water after bleaching and then reconnect it on BOTH ends. I know it is not easy to get water into that tiny little hole.

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a. You can buy an in-line water filter usually for under $25.00 and install it on the 1/4 input line to your fridge (The filter kits come with installation instructions) An easy job for anyone that can follow an instruction sheet.

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3. The diaphram in the water vavle dried up when the unit was idle. The diaphram rubber could have broke down from being dry and is now showing up in your ice as black specs.

I would not give up on the unit yet.... It sounds like with a little persistence it will be fine.

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  • Check the freezer temperature. If should be 8 degrees Fahrenheit or lower. If the freezer is too warm, the ice maker won't cycle properly.


  • The ice maker mold thermostat. Make sure that it's cycling properly.


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