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Hoshizaki ice machine model km 900mwh low side suction line has ice building up on it all the way to the compressor

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Dennis Boxerman

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  • Hoshizaki Master
  • 1,306 Answers

Is it making ice? Frost on this line is not that uncommon as it is colder than the air around it. Make sure you have good water flow over the evap plates. machine may just need a good chemical cleaning.

Posted on Feb 11, 2017

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5 Related Answers

Anonymous

  • 149 Answers

SOURCE: 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.

Posted on Apr 26, 2008

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Anonymous

  • 462 Answers

SOURCE: Hoshizaki ice machine with constant beeping every 3 seconds

I believe if you remove the thermostat wires and put them together and retry it you'll be making Ice, then get you a new thermostat. Please rate me accordingly and good luck.

Posted on Mar 20, 2009

Dennis Boxerman

  • 1306 Answers

SOURCE: Hoshizaki ice machine model KM-450MAB water runs

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

Posted on Apr 03, 2009

Anonymous

  • 16 Answers

SOURCE: need to clean an ice machine

http://www.hoshizakiamerica.com/manuals/KM-500M_E_serv.pdf

Cleaning Inst. start on page 52 and go to 56

Posted on Jul 07, 2009

Anonymous

  • 1515 Answers

SOURCE: My Hoshizaki KM-500MAE has ice built up inside the machine

If this unit is iced up this bad, when it goes into the harvest mode, if it has hot gas defrost or electric grid, its not working, The ice will continue to build up all around the coil, flaps, everywhere there is a place for ice to build up. When you defrost it, it will continue to do this. With out service gauges to check this unit when it goes into harvest mode you are not going to find the problem. I hate telling you this, but some things you cant check without special equipment and I know you are trying to save $$$ as we all are. You will need to call a tech out to install his gauges to do the internal checks on the unit and use his electrical meter to check other componants. Please let me know and keep me posted.
Sincerely,
Shastalaker7

Posted on Mar 19, 2010

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Hi i have km-320-mwh hoshizaki ice machine, this machine is discharging water in drain continuesly except when it is dumping ice is this normal ...too much water is being lost please help many thanks...

By looking at the model number it is a water cooled unit. It will dump water down the drain continuosly as that it how it cools the compressor. If it was a MAH it would be air cooled and no continuos dump of water.
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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
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Model km-250baf hoshizaki with weighed in correct amount of 404a the head preasure risies to over 400 psi i think it is the txv advise me if i am right

There are a lot of variables that cause high head pressure. Be sure the cool ing fan is operating properly. It should come on whenever the condenser coil feels warm to the touch. It will cycle on and off as the pressures change. A clogged up coil will also cause high head pressure. If you don't have sufficient water flowing over the evaporator plate, where the ice freezes, the head pressure will go up. You need to check the low side head pressure as well. Weighing the charge is a good start to charging the machine , but the first question I would ask is why are you charging it? Was there a leak, or compressor change?
If you had a compressor burnout, did you replace tthe drier-filter?If not, it may be stopped up from burnout residue. That will also cause high head pressure. If you did not vacuum the system there may have been refrigerant still in the system before you started the new charge. Check the items I mentioned and see if that helps.
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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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How far can the condensor be located away from ice machine

Their web site has all your answers. Their tech support line is worth the wait. 1-800-233-1940.

I usually don't exceed 25 feet. If it is a straight up install, that is, the remote is on a roof, you may have to install traps to ensure proper oil return to the compressor, Otherwise, it will lockup on ya.
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Hoshizaki km-1300skf 3 beep error code

The 3 beeps indicates that the freeze cycle is longer than 60 minutes. with the suction pressure at 20, it sounds like low on charge (freon). I believe this is an R 404-A unit. Other things to look for are: Stuck float switch (in the up position), Water valve leaking, hot gas valve leaking, txv not feeding properly, weak compressor. Look at high side pressure too. It should not go below 210 psi during the freeze cycle. Low pressure should be in the middle to upper 40's psi.

Let me know if you need more.
Jan 02, 2009 • Freezers
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Hoshizaki ice machine model KM-250BAF SERVICE MANUAL

km-450mwb hoshizaki problem is machine strate is ok but to long time ice making , not dropping, two beeps every three seconds what problem i don't no pleas help mi
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