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

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Harvest cycle on ice machines

During the harvest cycle the machine is not dumping water out the drain thus not bringing in fresh water causing the machine to shut down. system is clean new bin switch jets clear drains clear.

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  • pbjr0000 Nov 30, 2008

    I have a hoshizaki km-500 mah. It cycles to soon causing it not to produce enogh ice and it is also very small ice.

  • Anonymous May 06, 2009

    ice build up on my ice machine

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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.

Posted on Nov 30, 2008

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Do you have a spray bar attatched to the make-up tank? You must have a blow down water bar of some type spraying water into the screen to remove the ice and mineral deposits during harvest cycle. Your float will not provide the water for draining. You must have a secondary potable water source to blow off the ice tines and flush the water out the drain

Posted on Jul 01, 2008

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2 Answers

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

Water is leaking out drain during cycling; cubes are thinner than normal. Does water valve need to be replaced or check rubber gasket?


Just above the pump there is a check valve that may be stuck open
during operation which will cause thin ice. Also make sure you have the o-ring on the bottom of the drain tube if it was removed during cleaning.

May 20, 2014 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

What is hgv valve leaking by


The hot gas valve is activated during the machines harvest cycle letting hot gas defrost the evporator. If it is "leaking by " that means that it is not fully closing during the freeze cycle causing high suction pressures and inefficient operation of the machine. And maximum freeze cycles. If that is happening it will need to be replaced by a qualified technician.

May 09, 2014 | 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

We have a hoshizaki ice machine 901mwh the ice cubs seems to be getting stuck in the evaporator area and pileing up on it self and freezing bake up


The main problem with Hoshizaki machines is if you are in a hard water area, if so do you have a good quality water filter, it may need changing. A quick way to check for calcium ot lime deposits in the machine is
1. Turn it off, run you clean hand around the area near the evaporator, are there any rough or flaky deposits there, if so you may need a chemical descale, contact a reputable fridge guy to do this for you.
2. The swinging arm motor may be faulty or possibly the ice sensor which controls the harvest cycle. If this is faulty sometimes the tray goes back up before the ice has slid off.
3. If the machine is situated in a cellar or other cool (less than 10 deg C / 50 deg f) this can sometimes affect the harvest cycle again to set this you need a tradesman.
4. Does the water flow properly over the lower part of the mould plate during a harvest cycle, the pipe can become blocked or dislodged.

Hope this is helpful

Apr 14, 2011 | Hoshizaki Freezer Commercial Ice Machines...

2 Answers

Ice machine is only making flakey size ice. Machine is clean and filters have been changed. Water is flowing and cold; it appears that the machine is in constant operation.


sounds like there is a problem with the water in the sump escaping. Sometimes, the plastic grate under the evap plates break and pieces get stuck in the dump valve. It is a triangular piece that the pump attaches to via a hose. It is spring loaded and the pieces prevent it from seating, thus, water leaks into the drain that you will not notice. When the water level in the sump gets low enough, it goes into a harvest and drops small slivers of ice. I'd check that out first.
Hope this helps.

Feb 09, 2010 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

2 beeps every hr.already cleaned, checked freon,dropes ice after resetting it


2 beeps every 3 seconds indicate that the unit has been in the harvest/defrost mode for 20m minutes. If you are absolutely sure that the freon level is correct, check for a water problem. I have seen many a problem corrected by ensuring that the incomming water flow was correct. If you have water filters, change them. In many cases, at the very end of the harvest cycle, the unit goes into the freeze cycle but it brings in ground temp water which actually "rinses" off any laging cubes. I've done this many time with great success. But the freon level has to be exactly correct before doing anything else. Especially in cold weather, it is major important.
Hope this helps.

Jan 22, 2010 | Hoshizaki Freezer Commercial Ice Machines...

2 Answers

Ice Cubes won't drop out


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

Feb 18, 2009 | Freezers

1 Answer

Hoshizaki KM1800SAH Long Harvest cycle


i ewould check to see if the dump valvre or the fll valve were leaking thru for starters and also check to see 9if the head master was working properly. thanks for using FixIt and Merry Christmas

Dec 23, 2008 | Hoshizaki Freezer Commercial Ice Machines...

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