Question about Hoshizaki Commercial Freezer KM-500MAH

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Suddenly goes to harvest cycle, #1 green led is always on. overall it is not producing enough ice.

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  • Hoshizaki Master
  • 1,033 Answers

If the freeze cycle is too short, I would check to see if the plastic grid that is under the evap plates are missing any pieces. If so, then check the check valve to the left of the water pump. It is a white round plastic piece with a triangular attachment with 3 screws in it. Remove the screws with care as it is spring loaded. Check it for pieces of the broken grid as this will cause short freeze cycles.
Let me know if this does not solve and we will go a little deeper.

Posted on May 07, 2010

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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

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

KM450MAB my machine makes a batch of ice then goes into harvest cycle and dose not come out of it, it gets realy hot. What can be the problem?


Probably the suction line thermister, this sensor should signal a timer in the main control board to initiate harvest. If the thermister is OK than there may be a problem with the control board

Nov 20, 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

Small production of ice? What should be the normal production of ice?


The way I understand how Hoshizaki machines work, the model number is usually what the unit will produce, in pounds of ice. Their manual states: "Approximate production/ 24 hours @ 70 degrees air/ 50 degrees water (incoming)" So, yours should be producing 450 pounds a day, approimately. Since I can not pin point your exact model, I found one that is close. It states: "Ice Production per cycle: 6.6 pounds, 360 pcs." Again, it is not you exact machine. Their web site does not show this model either. So this is the best info I can get for you. Hope this helps.

Jun 03, 2009 | 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

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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