Question about Hoshizaki Freezer Commercial Ice Machines - KM900MRH Commercial Ice Machine

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Early harvest no ice or thin ice - Hoshizaki Freezer Commercial Ice Machines - KM900MRH Commercial Ice Machine

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There is an adjustable potentiometer in the pcb section. Adjust it to give a thicker cube. Also check water pump and clean any scale buildup from the sprayplate. If all else ok and still no ice suspect evaporator sensor.

Posted on Aug 07, 2012

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My hoshizaki ice machine KM-900mrf model beeps 3 times and stop making ice. After reset it starts, but stats beeping again after an hour.


Have a look at the side of the evaporator; there is a probe (thermistor) attached to it that tells the control board when to initiate the harvest cycle. make sure it's clean and attached properly and doesn't need replacing. If hitting the float switch initiates the harvest cycle it sounds like you have a blocked/ scaled water tube or switch housing. take off the bottom of the switch assembly (black rubber bit) and clean through to the water chamber. run a cycle of descaler before trying again.

Jul 04, 2015 | Hoshizaki Freezer Commercial Ice Machines...

2 Answers

I worked on a hoshizaki km-500mae when i turn it on the first cycle it makes good ice but after the first cycle it makes little pieces. why?


time the cycle. if it is only running about 5 minutes and going into harvest, look for sump loosing water. Look at where the unit drains (like a floor drain) while the unit is running to see how much, if any water is draining. does not take much to make an early harvest. also, sump may not be filling up completely but with just enough water to satisfy the float.

Feb 16, 2015 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

Hoshizaki km500mae just has continuous water flow through it. The only time it shuts off is when it is harvesting ice. This water is causing a huge water bill. Any suggestions?


You have an assembly that closes the water down when it is harvest ice. It is broke or out of adjustment. Have a rep look at it.

Feb 21, 2013 | Freezers

1 Answer

Why does my KML-600MAH only make water not ice?


Check to see how long it stays in the freeze cycle. normally it takes a least 20 minutes to make a batch. If less than that, you are probably loosing water causing an early harvest and almost no ice.

Jan 12, 2013 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

Unit makes ice,full evaporator,is very slow,maybe 45 mins. from harvest to harvest. Why so slow?


Possible causes are many
Things to check
  • If air cooled, is the condenser coil clean and is the condenser fan running when in ice production ? Is the area extremely hot where the ice machine is located? If water cooled, is there adequate water pressure and is the water regulating valve set properly?
  • When the system switch is in the off position is there any water running ( if so the inlet water valve may be stuck open)
  • When in ice production, is the small tube that feeds from the hot gas solenoid hot? This tube comes from a valve at the back of the unit and feeds over the compressor and into a tee near the insulated Tx valve. This line should be hot during harvest and cool shortly after harvest.
  • Has the float switch assembly been cleaned. this is a cylindrical unit beside the water pump,It can get plugged with minerals and not initiate harvest
  • The system may have a refrigerant charge problem (short) or the compressor may be weak, at which point diagnosis would need to be done by a refrigeration tech
Hope this helps

Oct 29, 2010 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

I Have A KM-900MRH Ice Machine Hoshizaky i, recently changed the water pump, and now sims to be that ice is really thin, and is not making enough.


adjust the float (White plastic with black rubber bottom) item next to the water pump. It needs to be all the way down. Loosen the 2 screws and slide it down all the way. This is what controls the size of the ice cube. Other possibility is that there is water leaking our of the sump causing and early harvest cycle to start. Look for both.

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

1 Answer

Does a Hoshizaki Model F-1001MWH have a Defrost cycle? As far as I know the "defrost" is the harvest cycle correct?


Ice makers defrost is the harvest cycle. The purpose of a defrost cycle is to clear any ice build up, right?

Jul 08, 2010 | Hoshizaki Freezer Commercial Ice Machines...

2 Answers

Hoshizaki ice machine repair?


seems that its low on water or float switch is bad. try to clean float

Sep 02, 2008 | Hoshizaki Freezer Commercial Ice Machines...

2 Answers

Harvest cycle on ice machines


My ice machine Hoshizaki km-500 mah is cycling to fast. Causing poor production of ice it's real small and it doesn't produce enough ice aswell. Wha seems to be the problem.

Jun 20, 2008 | Hoshizaki Freezer Commercial Ice Machines...

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