Question about Hoshizaki Cubelet Ice MakerDispenser Water Cooled LED Sensor Operation

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Hoshizaki KM-450MAB Ice Machine

Put power on machine, it will go into freeze cycle. It will complete the freeze cycle and go into harvest cycle. After about 10 to 15 secounds into harvest cycle, the board just shuts down, like the power is shut off. The red power lite is off. It's hard to get the board to power back up. The cleaning cycle still works. Tink it might be the board? Jonnie Stephenson jonnielazy@hotmail.com

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  • jonnielazy Feb 25, 2008

    Turned out to be a bad hot gas valve coil. Your answer put me in the right direction to find the problem. Thanks

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Maybe not. it could be that the heating cycle is taking a lot of time to remove the ice from the evaporator that is why the electronics is shutting off the compressor as a protection. check the heating cycle if it is working fine. check the evaporator for dirt that would hold the ice slab from falling down quickly. check the level of the unit. it may have move and now its out of level. the unit must be leveled with the ground.

Posted on Feb 21, 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.

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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

Its a 450 mah hoshizaki, it keeps jumping from freeze cycle to harvest cycle without giving it enough time to make a load of ice


usually, if it does not stay in the freeze cycle long enough to make ice or it just makes slivers of ice, it is loosing water. during the freeze cycle, look to see if water is draining down the drain from the machine. If not, I would look at the float position. it should be almost completely in the lower, down position. give that a shot.

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1 Answer

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.

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1 Answer

Hoshizaki ice machine model KM-450MAB water runs constantly even on freeze cycle. Water is very cold.


Hoshizaki machines have a water inlet valve that can stick in the open position. This will cause the machine to do silly things. If you can turn the machine off and you can still hear water running, the valve is stuck open. It is an easy fix. Water valve only has 2 wires going to it and 2 water lines. One inlet and one outlet. Just turn off water and kill power at the breaker before doing any work.

Hope this helps and good luck.

Try Rick and Restaurant Parts and More in Ohio for a replacement valve. 1-888-814-1110

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If water is standing in the bin the drain is clogged. If water is raining down into the bin, Machine may not be level or the drain on the ice machine maybe partially clogged. If machine freezes up water will rain into bin too. Water fills ice machine while in harvest and continues to fill until ice machine`s suction reaches 49 degrees and the defrost timer times out.(usually 1-3 minutes after suction line reaches 49 degrees)

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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.

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3 Answers

Hoshizaki Ice Machine Model KM-500MAF


(Quated From Hoshizaki Technical Bulletin)
An alarm code of 3 beeps
every 3 seconds means that the control board has shut
down on the 60 minute freeze cycle back up timer.

The “E” control board has a 60 minute timer that starts at
the beginning of the freeze cycle. If the float switch fails
to open and start the next harvest within 60 minutes, the
board will automatically start the harvest cycle. If this
occurs in two consecutive cycles, the control board will
shut the unit down on the manual reset, freeze cycle
back- up timer. The yellow fault LED marked “60 min.”
will illuminate. This safety is designed to help prevent a
freeze up of the evaporator.

Once you have identified the 60 minute alarm, there are
several things to check. Reset the alarm by depressing
the white reset button to the right of the fault LED’s.
This must be done with the power “ON”. Now check the
float switch to see if it is stuck in the up position. A stuck
float can occur if scale is present on the reed switch
shaft inside the housing. To check it, drain the water
reservoir, unplug the black float switch connector (K5)
from the control board and check it with an ohm meter
for a closed switch (zero ohms). If the float switch is
sticking, clean it with ice machine cleaner or replace it as
necessary.
An inlet water valve which is slowly leaking by during the
freeze cycle can cause a 60 minute alarm. If the inlet
water valve is stuck wide open, it is unlikely that any ice
will form on the evaporator. Check for a slow leak by
allowing the unit to cycle into the freeze cycle and
disconnecting the hose at the outlet of the water valve. If
water leaks by during the freeze cycle, the water valve
diaphragm is likely damaged or the small diaphragm bleed
port is clogged with scale. Clean the bleed port or replace
the diaphragm or entire water valve as necessary.

(I Recommend to get a refrigeration tech for this part).

Another possibility is a refrigeration system problem. You
should use normal refrigeration diagnosis procedures to
check for one of these problems. If the thermostatic
expansion valve is not feeding properly or the refrigerant
charge is low, the evaporator will not form ice as it should
and a long freeze cycle will occur. This could also be the
result of the hot gas valve not closing completely during
the freeze cycle or if the compressor valves are weak or
inefficient. An inefficient compressor however, will
usually show up first on the KM model through a longer
than normal harvest cycle. This is because of cooler
than normal discharge gas. Use proper refrigeration
practices to repair a refrigeration system problem.
While these are not the only reasons for a 60 minute
freeze cycle, they are the most common and should be
checked to resolve a 3 beep/yellow fault LED alarm.

Feb 27, 2008 | Hoshizaki Commercial Freezer KM-500MAH

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