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

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Frosting coolant lines

The copper lines on my commercial ice maker keeps frosting over and then actually freezing up. Once the line freezes the unit will not make anymore ice. I am an electrician so I am familiar with troubleshooting problems, but I am not a HVAC person so I don't know much about coolers or icemakers

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  • 27 Answers

Check the machine in let line water flow is low ,
clean the filter

Posted on Jun 23, 2008

Check the ice cube control

Posted on May 09, 2008

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1 Answer

My Ice maker doesn't make ice anymore


90% of ice maker problems are water related. Sounds like water may be continually seeping in from the inlet water valve (normal thing to do if the water level is low). This will not allow the water to get down to freezing temperature. You have to identify the reason that water is constantly running in. It's probably "leaking" out at the dump valve. Or does that unit have a float valve that may be leaking. Check your drain to see if water is leaking out during the freeze cycle.

Jul 07, 2014 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

Iam working on a hoshizaki ice maker, turn it on make one batck of ice, after that, my cooper lines on bottom of coils were warm and o n top od the coil were hot,whar could be the problem?


On Hoshi ice maker, if coils are HOT, it is passing hot gas from compressor into the lines. After the defrost of the first cycle, after this cubes are completely cleared from the plates, the "Hot Gas Valve" should close and the freeze cycle should start over. It sounds that the valve is sticking open and not stopping the hot gas from entering. Look there first.

Sep 10, 2011 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

3 yr. old Hoshizaki km630 mah, Had a hard freeze(24 degrees) at the shop and checked the ice maker that sits outside main bldg. Main water supply line inside that joins the copper pipe to the plastic...


There should be a reset button on your control board inside the electrical compartment.

Turn the system on to ice mode and depress the reset button. This should clear out any and all faults stored in the board and the machine should at least attempt to come back to life.

Look on the outside of the electrical compartment cover. There should be an explanation of what your error code means. I can't remember it off the top of my head. But the list there will tell you what 1 beep every 305 seconds means and the procedures to take from there.

Jan 13, 2010 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

It beeps 3 times then pauses then beeps 3 times then pauses. Keeps this pattern


Unit was in the freeze cycle for 60 minutes and the freeze back up timer took over the process. In most all cases, either a stuck float switch or a leaking water valve.
Hope this helps.

Sep 25, 2009 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

Ice maker not making ice


The water inlet valve on the back of unit opens when the ice maker needs water. If the valve doesn't seal good because of sediment or wear it will continue to drip and when the water reaches the ice maker supply tube it will freeze. You can take the water line off the valve and watch to see if it drips and replace it if it does.

Try swapping the wires on the dual water inlet valve. Then try the water dispenser. The water should go to the ice maker. This will tell you weather or not the ice maker valve is working and if the line is clear.

Sep 03, 2009 | Freezers

1 Answer

Too much water coming out of the pan (in the front of the ice maker) and copper pipes on top left side are covered with ice.


Not real sure just what you are saying as to what pan? The copper pipes that go to the evap plates where the ice is made are supposed to frost over. They get colder than dew point of the air so this is normal. But all the pipes should frost. Does the unit shut down and give any type of beeping noises? This would be the control giving you a trouble code. You may have a water valve leaking. Turn unit off and see if water continues to run. All water should stop within a few seconds. Let me know what you find. Please verify model and serial numbers.

Aug 13, 2009 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

The Hoshizaki km450wmb ice maker freezes, but does not drop the ice. The line going back to the compressor ices over as well as the lines going through the cube maker area.


Here are a couple of reasons this may be happening.
1: Unit needs to be chemically cleaned to remove lime and scale build up.
2: the hat gas valve that is used to warm plate and release ice is not working properly.

Jul 16, 2009 | Freezers

2 Answers

Thaw's. Turn-off for period of time it would freeze as normal


Make sure nothing is inhibiting air flow. I don't think it is advisable to store food in an ice machine however that is not likely the problem unless the food itself is inhibiting air flow. Most ice machine manufacturers recommend against storing any food in an ice machine. If there is a freezer component in you model the check to see if the evaporator coils are frosting up and the frost is blocking airflow causing the ice storage chamber to get warm. High humidity can cause frosting. Leaving a door to the ice maker open too long can cause frosting. A low refrigerant charge can do this although it seems logically like it should not. With a very slightly low charge one end of the evaporator gets super cold and the other end is not cold enough. Frosts starts collecting on the super cold end and accumulates across the evaporator coil to the other end eventually blocking all air flow. With too much humidity from open doors frost accumulates over the entire evaporator evenly but still blocks. You shut the unit down. It thaws out and works OK on restart until frost again builds up. If its not a frosting problem but it just stops making ice then the ice may not be releasing. Check the water supply and change any filters to insure good water flow. A good water supply is required for proper release and harvest of the ice in many ice machines. If the ice doesn't release it takes a shut down and thaw to clear the suspended ice out. Check for these things and write back if you need further assistance and can provide me with more details.


Jan 19, 2009 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

True commercial freezer


The ice could be preventing the freezer from freezing properly, try defrosting the unit. if this does not help then this could indicate a more serious problem like a bad temp sensor or refrigerant leak.

Apr 27, 2007 | True 52 cu. ft. / 1472 liter Commercial...

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