Question about Hoshizaki Commercial Freezer KM-500MAH

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Hoshizaki Ice Machine starting problem after shut off

After noticing ice forming around the water lines inside the front panel, I decided to turn it off to defrost. When I tried to turn it back on it would not start again.

Any ideas?

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I am guessing there is a safety switch somewhere which is gauging how much water is left in a defrost tray. Other likely things: open circuit breaker from the water shorting things out. Start with these. Other, more exotic things could be involved...but not as likely as the above.

Posted on Dec 04, 2007

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Posted on Jan 02, 2017

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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


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.

Jun 14, 2014 | Hoshizaki Commercial Freezer KM-500MAH

1 Answer

Our Whirlpool WV1600NFW freezer has frozen water forming on the front of all drawers from top to bottom. The manual's troubleshooting does not address this issue.


first thing you would do is turn off or unplug the unit for 12 hours then when you plug the unit in before hand you would remove the rear panel on the inside of the freezer. then pluging in the unit again you would have to distinguish if this is caused by your icemaker and the water not going into the ice tray or if you have a defrost issue with your unit where as one of the defrost pieces such as the defrost timer the defrost heater or the defrost thermostat is not activating properly when these pieces do not activate it forms a build up of ice around the evaporator which is found in the rear of that panel but I personally think the issue is coming from when the water comes into your icemaker and maybe the icemaker is not recognizing that it is full and continues to pump water into the unit or the tube that brings the icemaker water is not aligned properly. If you have any further questions message me back and please remember to rank this opinion when our chat has fully concluded it allows me to help others in similar situations and if you are unable to defrost by turning the unit off for 12 hours you can use a hair dryer to defrost the build up of ice Thanks Rick

Apr 21, 2011 | Whirlpool WV1800NFW Upright Freezer

1 Answer

Hoshizaki ice maker am-50bae . Made ice regularily--- filled ice bin half way...next day-- all ice melted away with no more new ice? next day shut off for 3 hours now o new ice.


make a few quick checks. If there are water filters on the system, be sure they are not restricked. Could be clogged. Next, check the bin stat. It usually is mounted in the ice bin. If it breaks or goes bad, it shuts down the machine. Start there and let me know if I can be of any further help.

May 19, 2010 | 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

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

Frost free freezer forming layer of clear ice on floor of freezer


This sounds like clogged drain / hose in the freezer compartment, here's why:

When the defrost circuit turns on, the compressor turns off. The defrost coil melts frost that collects on the freezer coil and drips in to a small pan located below the coil. The pan is formed so that the water that drips in it can flow to a hose connected under it. When the defrost cycle completes. the compressor runs again, bringing the temperature in the freezer to about 0 again. Any water remaining anywhere in the freezer will turn to ice very quickly.

If the hose should become clogged with ice, or slowed by mold, bacteria, etc. - water flow will be slowed, and / or eventually stopped. Ice will become thicker and thicker on the floor of the freezer as there is no place for the water to go.

A service manual for the appliance would be a good idea, but may not be required. You'll need to unplug the freezer and empty the contents. Defrost manually with a hair dryer or other heat source. If you decide to chip away ice, do so carefully.

The defrost and drain area of most refrigerator / freezers are located behind the rear panel of the freezer compartment. This is where the manual would indicate where the parts are located. Remove any ice maker installed if needed to remove the back panel.

Defrost any ice previously hidden by the panel. Chipping ice here should be a last resort, as sharp edges can damage cooling coils, tubing and the drip pan itself. Use a turkey baster filled with hot water to direct a stream at the area of the pan filled with ice. Hot water will likely have to be directed down the opening on the pan to melt ice in the hose as well.

Once the ice is cleared, mix about a 10% to 20% solution of bleach and water (1/2 ounce bleach to 3 ounces water) and direct down the drain hose. This will kill and inhibit further growth of mold and bacteria in the hose, which should help it drain water quickly.

Re-assemble and plug into power.

I hope you found this Very Helpful. If you need more help, ask again - but include the freezer manufacturer's name and model number. Good luck!

Dec 03, 2009 | Freezers

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