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The Hoshizaki km450wmb ice maker freezes, but does not drop the ice. The line going back to the compressor ices over as well as the lines going through the cube maker area.

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Here are a couple of reasons this may be happening.
1: Unit needs to be chemically cleaned to remove lime and scale build up.
2: the hat gas valve that is used to warm plate and release ice is not working properly.

Posted on Sep 23, 2009

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Hoshizaki ice machine model km 900mwh low side suction line has ice building up on it all the way to the compressor


Is it making ice? Frost on this line is not that uncommon as it is colder than the air around it. Make sure you have good water flow over the evap plates. machine may just need a good chemical cleaning.

Jun 14, 2014 | Hoshizaki Commercial Freezer KM-500MAH

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Iam working on a hoshizaki ice maker, turn it on make one batck of ice, after that, my cooper lines on bottom of coils were warm and o n top od the coil were hot,whar could be the problem?


On Hoshi ice maker, if coils are HOT, it is passing hot gas from compressor into the lines. After the defrost of the first cycle, after this cubes are completely cleared from the plates, the "Hot Gas Valve" should close and the freeze cycle should start over. It sounds that the valve is sticking open and not stopping the hot gas from entering. Look there first.

Sep 10, 2011 | Hoshizaki Freezer Commercial Ice Machines...

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Hoshizaki KM-900MAH Ice Maker it sounds like it is making ice and is freezing it but its not dropping ice any solutions?


when the machine first starts, it begins it's cycle in the harvest mode. If the float switch is stuck, it stays in the fill/ harvest mode. Compressor runs and water circulates but no ice is being made. I'd start looking there. Turn the machine on, let it run for about 3 minutes, they very lightly tap the float switch. If it starts making ice, bingo, theres your problem. Let me know if I can be of any more help.

May 12, 2010 | Hoshizaki Freezer Commercial Ice Machines...

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Hoshizaki KM-900MAH Ice Maker it sounds like it is making ice and is freezing it but its not dropping ice any solutions?


Do you hear the machine cycling like normal but just not dropping? Could be the hot gas solenoid. If you never hear it trying to drop that could be anything from a dirty condenser to dirty plates to bad ice thickness control. Run some ice machine cleaner through it and blow the condenser out.

Mar 20, 2010 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

3 yr. old Hoshizaki km630 mah, Had a hard freeze(24 degrees) at the shop and checked the ice maker that sits outside main bldg. Main water supply line inside that joins the copper pipe to the plastic...


There should be a reset button on your control board inside the electrical compartment.

Turn the system on to ice mode and depress the reset button. This should clear out any and all faults stored in the board and the machine should at least attempt to come back to life.

Look on the outside of the electrical compartment cover. There should be an explanation of what your error code means. I can't remember it off the top of my head. But the list there will tell you what 1 beep every 305 seconds means and the procedures to take from there.

Jan 13, 2010 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

The ice maker has stopped working


Is the freezer cold enough? Should be close to 10 degrees.
Is there water or ice in the ice mold? If not put water in it and see if it dumps the ice after it’s frozen. If there is ice, lift the cut off arm and let it drop to see if it will start.
If it does dump the ice but don’t refill with water.
Try swapping the wires on the dual water inlet valve. Then try the water dispenser. The water should go to the ice maker. This will tell you weather or not the ice maker valve is working and if the line is clear.

The water inlet valve on the back of unit opens when the ice maker needs water. If the valve doesn't seal good because of sediment or wear it will continue to drip and when the water reaches the ice maker supply tube it will freeze. You can take the water line off the valve and watch to see if it drips.

Aug 24, 2009 | Freezers

1 Answer

Hoshizaki ice machine KM500-MAE not sending water to harvest


I would not change the pump. If it runs for 3-5 minutes and stops, it has to be a control. The control board runs the freeze cycle for the first 5 minutes. This prevent "Short Cycling" of the freeze cycle. The board looks at the float after the first 5 minutes for the proper water level but should not effect the pump. If the pump does not run in the wash mode, check out the "Power/ Wash" switch. I would start there before I go spending hundreds on pump motor or control board. You may be able to get by on a $20 fix! Do this and get back to me. We will get it going.

Good Luck

May 06, 2009 | Hoshizaki Commercial Freezer KM-500MAH

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