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

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Hoshizaki M# DCM-270BAH-OS runs for days then freezes up evap coil and stops water inlet to evap.

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There is a thermostat probe sat on the front of the evaporator to tell the control board when to harvest. Check it is tight in it's holder. Check the condenser is absolutely clean and filters clear. You can adjust the thickness of the cube. set it on the thinnest setting and see if it harvests before freezing solid.

Posted on Jun 15, 2012

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Posted on Jan 02, 2017

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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

woodchuck789
  • 4070 Answers

SOURCE: ice up on the coil

DEFROST PROBLEM The evaporator coil behind the cover on the back wall inside the freezer will ice up under normal conditions. Every 8 to 10 hours for around 20 minutes the defrost timer (or in most newer models the electronic adaptive defrost control) will turn the defrost heater on to melt the built up ice. There is a defrost thermostat which prevents the heater from overheating the freezer by breaking the heater circuit when the temp reaches close to 32 degrees F. The entire cooling system shuts off during the defrost cycle and starts back when the timer advances through the cycle.
If this ice is not melted it will continue to build up until the air can’t flow over the coil to circulate the cold air through the freezer and into the fridge. The temperature change in the fridge is usually noticed first followed by the freezer.
If the defrost thermostat is bad, it can prevent the heater from coming on OR it won’t turn the heater off when it gets too warm. It is clamped to the evaporator coil at the top to sense the temp. If it appears to be misshapen it is bad. With an ohm meter it should show continuity when cold and none when warm. You can also bypass(disconnect the two wires plugged into it and twist them together) the thermostat to see if the heater comes on then. If it does then you know the thermostat is bad and needs replaced.
The defrost heater is located on the evaporator. It is in a tube which is at the bottom and can also go up the sides of the evaporator. On some types you can see a burnt spot if it’s bad. With an ohm meter it should show continuity from end to end when disconnected from the wiring in the freezer. You can also test the wiring for voltage when it’s in the defrost mode.
If you have a defrost timer you can test it. It can be located under the fridge behind the kick panel on the front. Some are in the fridge with the controls at the top. You can turn the defrost timer till it clicks and everything shuts down. The heater should now come on. If it does, replace the timer because that means the timer is not running. If it doesn't, check the heater and defrost thermostat. Turn the timer again till everything starts back up to end the defrost cycle.
If you have an adaptive defrost control instead of a timer, replace it if the heater and thermostat test good. It is located in the fridge with the controls in some models and on the back in others.

Posted on Jul 20, 2010

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1 Answer

Hoshizaki IM130 ice machine that will not freeze,the coil wire (i think)used to heat up and now not any more? Have pressed the reset button and the same issue remains, water running just not freezing.


http://www.hoshizaki.com/docs/manuals/IM-130_132_210_212_serv.pdf
this web site from Hoshizaki does not show or indicate any wire for heating. See sequence on page 10. You may want to read thru this as this may help you understand how it works and what you may need to address. Let me know if I can be of any further help.

May 31, 2018 | Hoshizaki Freezers

1 Answer

I have a hoshizaki ice maker that is giving a three beep code and the compressor will not start. i have cleaned the float and have water to the machine


3 beeps means freeze cycle too long. usually it's a stuck float or a water valve leaking most all the time. A low refrigerant level, weak compressor, bad TXV, or a leaking hot gas valve are usually secondary issues but not very common. In rare cases, the evaporator plates can separate from the refrigeration tubes. look at evap plates at the bottom and top and see if they are bowed or odd shaped.

May 03, 2017 | Hoshizaki Freezers

1 Answer

COILS FREEZING UP


On Hoshizaki freezers, it has several items that can cause this. Check to see if the heater in the evap are heating up when in defrost. Older machine can force a defrost by just unplug and then plug back in to outlet to do this. There is a "Klixon" type thermostat that disconnects the heaters in case of an overheating condition. These go bad fairly often. Make sure the door closes and seals. Be sure not to do anything that hampers air flow over the evap.

Jun 25, 2014 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

Hoshizaki dcm 500 freezing up suction line


This calls for a tech that is familiar with this stuff. I have one a work and it runs great but I can't fix me. There several things it could be. Is it waking water anywhere. And does it run constantly.

Jan 28, 2013 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

I have a Hoshizaki Model KM500MAE that keeps freezing up. What can I do to stop this problem


several things cause freeze ups.
If you have water filters on the water system, be sure they are not restricting the water flow. water flow pressure should not go below 20 psi.
The bin stat may not be shutting off the unit properly. It should shut off machine within 10 seconds of ice making contact.
Make sure the float switch is not dirty. Be careful when cleaning. Fragile
Make sure water pump runs the entire time it is in the freeze cycle.
Be sure the evaps are clean. Ice cubes will hang on if not clean.
Water solenoid has a screen where the water line screws on to it. Turn off water and check screen to be sure it is clean. This can restrict water flow.
Make sure water valve closes all the way. Turn machine off and see if water is still running. Valve may be leaking water thru.
Dip switches on the board, #1 and #2. Turn them both on and it will change the defrost time to 3 minutes. If both are off, they are set on 1 minute.

Hope this solves your problem. Let me know

Apr 07, 2010 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

Hoshizaki ice machine KM500-MAE not sending water to harvest


I would not change the pump. If it runs for 3-5 minutes and stops, it has to be a control. The control board runs the freeze cycle for the first 5 minutes. This prevent "Short Cycling" of the freeze cycle. The board looks at the float after the first 5 minutes for the proper water level but should not effect the pump. If the pump does not run in the wash mode, check out the "Power/ Wash" switch. I would start there before I go spending hundreds on pump motor or control board. You may be able to get by on a $20 fix! Do this and get back to me. We will get it going.

Good Luck

May 06, 2009 | Hoshizaki Commercial Freezer KM-500MAH

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

Apr 01, 2009 | 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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