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

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Turn the unit on and it fills up with water,then goes into defrost cycle then into freeze cycle it starts freezing then just cuts off with no lights on board, not even red power light then will try again in a few minutes and does same thing

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  • Hoshizaki Master
  • 1,169 Answers

Most all of Hoshi ice makers have power go thru the bin stat first. It sends power to the board and everything then powers up. Start there and get back to me.I will need model and serial numbers to be sure I have the correct wiring diagram for your unit should we need to go any further. Good Luck.

Posted on Sep 13, 2010

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Posted on Jan 02, 2017

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1 Answer

Slow ice production


that could be one solution. I would look at how long the freeze cycle is lasting. The machine could be cycling off and on via bin stat. Average cycles from start of freeze cycle to start of freeze cycle is usually around 25 minutes or so. If it is taking longer than that, you may have to dig deeper. let me know. Don't overlook a leaking water valve.

Aug 23, 2012 | Hoshizaki Freezer Commercial Ice Machines...

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The temperature keeps on rising. everything inside is melting. does not freeze anything. fan and light is working.


Turn it off, defrost it for a couple of days """""with the door open""""", restart it with door closed and see if it starts freezing again after about 2-3 hours, if so, then the draw unit works, that indicates the defrost cycle needs to be reset or one of the defrost elements has failed causing the rest no to do anything. Any probs call me on 08 9523 0552 Russ

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Ice has accumulated at the bottom, food at top is slowly defrosting


I believe that the defrost system has malfunctioned. There is a timer that cycles the automatic defrost. The timer shuts off the freezer and turns on a heating element. Then it will cycle back to freezing. If anything goes out in this system the unit will not defrost. over time the cooling fins and below will fill up with ice and the fan can no longer recirculate air so the bottom becomes ice and the top warms up...

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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

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DO NOT TRY TO MODIFY TIMING CYCLE.you would need to completely modify printed circuit board and inbuilt computer......some freezers cycle around 6 to 8 hours.the temperature can only be checked say every 12 hours to get an average reading

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I wondered how long the defrost cycle was supposed to run on this Turbo Air TGF 49F freezer as I am not sure if a door was left ajar or if it is stuck on defrost if possible. I would like to manually over...


If it's frosted up, it's best to defrost manually with heat gun. Find the timer and advance until it goes back into defrost. The timer looks like a residential fridge. It cut the compressor off and the heaters on.
Please rate solution

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My walk-in freezer is developing stilagtights (ice castles) on the floor and cieling in front of the evaporator coil.MY drain pan is not plugged when I pour water down it.


You should check for air leaks around the door gasket or any other openings in the compartment such as where pipes or wiring is going through the wall. It sounds like a moisture problem from moisture being drawn into the compartment pass door gaskets or access holes.

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Freezer not defrosting between cycles


Check the defrost timer for operation if your unit has one. Some Delfield models have solid state controls. If your system has a timer for the defrost you can open the timer cover and turn the dial in the direction indicated by the arrow until a time peg comes up to the time of day marker. You will hear a loud click and the compressor will shut off. Defrost should take place. The inner dial of the timer will have some indication as to how long in minutes the defrost should take. If the pointer does not move while in the defrost position the timer motor is bad. Turn the dial again so the copper pointer goes past the time of day marker and the compressor should restart. Replace the timer.

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Ice build up in my frost free upright freezer


I looked at the BACK at the bottom underneath of my Sears Kenmore frost free upright freezer and what was causing the ice buildup was very simple. At the factory, the assembler looped the little hose too high and when the water went into the hose it could not get out due to being too high in one spot! An ice dam will form, blocking ALL water coming through
and freezing up any more water coming down giving you a HUGE wad of ice that is scary!!! I just removed the screw holding the loop that holds the hose and put a bit of warm water down the little hole on the INSIDE (Behind the grate) to melt the remaining ice in the tube.You need to take out 4 screws and remove the grate to see this. I could not believe that this was the problem! I haven't had any ice build up since.Now don't tear your freezer apart before you try this trying to fix the compressor, thermostat etc. It may be the only thing wrong with it!

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