Question about Hoshizaki Commercial Freezer KM-500MAH

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My ice machine only harvest 2 time and start to 3 beep eveaperater very clean no scales inside because i descale every 2 weeks can u help me

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  • Hoshizaki Master
  • 856 Answers

In most cases, there is a chart on the inside of the front cover. It may also be located on the side of the box where the control circuit board is located. It will tell you what the 3 beeps mean. Hoshi has a great tech support. It's worth the wait.

Posted on Feb 09, 2009

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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...

1 Answer

Will not turn back on 3 beeps


remove the screw(s) and slide the cover towards the front (the cover over the control board near the wash/ice switch.) with the machine on carefully locate the reset button on top of the circuit board and push to reset..

Mar 18, 2014 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

Early harvest no ice or thin ice


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.

Aug 06, 2012 | Hoshizaki Freezer Commercial Ice Machines...

2 Answers

Hoshizaki km-900mah not going into harvest when float switch opens. New circuit board installed still no harvest. I can set an egg timer and manually operate machine but I can't leave it unattended...


Hoshizaki machines must have a very clean evaporater other wise the ice will bind causing a slow harvest. This may be from lime scale build up. "Lime A Way" is recommended for this proper cleaning. After that is done check to see that the water inlet valve screen is clean and that you have a filter installed.
Last check the thermister attached to the suction line.
http://www.hoshizakiamerica.com/techtips/Pdf/All/tips105.pdf

Aug 01, 2011 | 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...

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...

1 Answer

Beeps 2 times every 3 seconds


This is the safety telling you it is staying in defrost (Harvest) cycle for more than 20 minutes. In most cases it's either a low freon level or a back head pressure device commonly called a "Head Master". Needs to be checked out by a trained tech. Not a simple fix.
Hope this helps.

Nov 22, 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

1 Answer

Machine takes long to harvest


how many beeps this is a code telling you the machine has a problem Also about 90% of Ice Machine problems are due to the unit not being cleaned. Let me know the # of beeps and I will let you know the problem from the manual

May 20, 2008 | Hoshizaki Commercial Freezer KM-500MAH

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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