Question about Hoshizaki Commercial Freezer KM-500MAH

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Unit not coming on

Model sdo452a unit not coming on the board reads clean and water probe and ice probe and sl1 but doing nothing

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  • Hoshizaki Master
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Start out by putting the power switch in the "Wash" position. If pump motor comes on, but unit does not run in "Ice" position, more times than not, it's the power switch. If nothing happens in the "Wash" position, check the bin t'stat. It's probably open and not letting power go through it.
Good Luck and hope this works. Get back to me if it doesn't and we'll go a little further. Please get serial number too.

Posted on Oct 06, 2009

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Posted on Jan 02, 2017

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My hoshizaki ice machine KM-900mrf model beeps 3 times and stop making ice. After reset it starts, but stats beeping again after an hour.


Have a look at the side of the evaporator; there is a probe (thermistor) attached to it that tells the control board when to initiate the harvest cycle. make sure it's clean and attached properly and doesn't need replacing. If hitting the float switch initiates the harvest cycle it sounds like you have a blocked/ scaled water tube or switch housing. take off the bottom of the switch assembly (black rubber bit) and clean through to the water chamber. run a cycle of descaler before trying again.

Jul 04, 2015 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

Hoshizaki water dont stop runing


float switch is stuck in the "down" position. The unit goes thru a fill cycle and after 1 minute, the board "Looks" at the float swith to "see" if the sump is full. If float is stuck down, it tells the board that the unit does not have enough water and stays in the fill cycle. The compressor will not come on as long as the machine "thinks" there is not enough water. let me know if I can help further

Aug 02, 2012 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

Hoshizaki km-900mah ice maker won't start the freeze process


cycle is, fill cycle for 1 minute first. If there is not water entering the unit when first turned on, look for that issue. Water turned off, water valve not working or some restriction, clogged water filters, etc. That is got to happen first. Don't over look the bin stat being bad. Nothing happens if teh bin stat is bad. It sends voltage to the control board that runs the unit.

Jul 28, 2012 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

Hoshizaki Model KM 630 MAE


Look for a stuck float switch. unit fills with water for 1 minute, then the board "looks" at the float to "see" if there is enough water in the unit to run. If float switch is stuck down, it tells the unit there is not enough water and the unit stays in the fill cycle causing the sump to overflow and send water down the drain constantly. Compressor will not run till the board senses that there is enough water to run.

Jun 25, 2012 | 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

I have model 630 mwf water cooled keeps beeping twice i reset clean machine water well clean float will cycle a few times and then beep again what should i do next


Hi, I have worked on these machines many times, air and water cooled. Do you have a code chart on a panel to tell you what the 2 beeps are on the control board? Do you have the original troubleshooting manual? This would be of a lot of help. This KM900 is a good size ice machine. I would pick up a gallon of nickle safe ice machine cleaner at a refrigeration parts house, read the instructions and run the machine through the cleaning cycle again. Hand clean everything you can get to again, this is the biggest problem I find on water cooled units. The nickel safe is an excellent cleaner made for this problem. Do you have a water softener for the inlet water on this machine? If not I would recommend having one installed. This will cut down on a lot of problems you will have in the future. Try this and get back to me and let me know. In the mean time I will research this ice machine to see what I can come up with.
Shastalaker7

Feb 16, 2010 | Hoshizaki Freezer Commercial Ice Machines...

2 Answers

My ice machine does not make enough ice


Check the water filters first. Then check the condenser coils for dust and dirt. Determine which way the air goes thru the condenser coils and check on the side the air goes into. There are coil cleaning sprays that work good. If it is still slow, it may need gas. That will require a service call from a technician.

May 05, 2009 | Hoshizaki Freezer Commercial Ice Machines...

1 Answer

Im45le-25 defrost appears to go to long thus deforming evaporator probe holder & damaging probe as wont go into harvest mode .does machine use time as well if probe etc fail


Yes, the sensor detects the temperature of the evaporator plate then the PCB reverts to the adjustable timer. Check the probe in a glass of ice water. the reading should be between 5-7k ohms. if out of this range replace the probe. also check heat transfer paste is on holder and good contact is made probe to plate.
Be sure you are adjusting the pot the correct way as the large refers to the dimple in the cube not the thickness of the cube. ie its backwards to the initial thinking.

Mar 31, 2009 | Hoshizaki Freezer Commercial Ice Machines...

2 Answers

Ice maker runs continueously


I don't have the details on you machine but if I were going to trouble shoot this problem, assuming its a temperature probe I would power off the machine, remove the access panel and remove the temperature probe and check it with an Ohm meter or continuity checker for proper functioning by putting the probe in ice and see if it opens electrically. Sometimes the probe is not a simple thermostat type. The bin control on some machines is optical. The ice pile breaks a light beam to turn off ice making. Sometimes the probe is a thermistor. These latter two kinds of probes have electronics connected to them. A simple ohm check will not work for these cases. You can tell what kind you have by looking at it carefully. The thermostat kind that can be checked with a continuity checker or ohm meter is a sealed metal tube. The optical type has a light source and a separate pick up sensor. The thermistor type is a very small device on the end of a pair of wires. For the optical type or the thermistor type write back for more details.

Nov 30, 2008 | Hoshizaki Freezer Commercial Ice Machines...

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