Question about Hoshizaki Cubelet Ice MakerDispenser Water Cooled LED Sensor Operation

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Compressor starts then shuts down like head pressure building to high

Km-450mab starts to run water for one min then compressor kicks on for about half min or so then sounds like head pressure high -boggs down and kicks overload out.kicks over load out each time trying to start.compressor sounds good first time comes on

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Make sure that your condenser fan is working. If your unit is water cooled make sure you have water flow.

Posted on Feb 20, 2009

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Ice machince is going max freeze cycle shut down


1. Possible cause. Water leak. Check purge valve, water curtain, sump, sump hose.
2. Air filters clogged. Clean air filters.
3. Dirty condenser. Clean condenser.
4. Restricted location, intake air to hot. Have machine moved.
5. Ice thickness sensor dirty or disconnected. Check ice thickness sensor probe.
6. Water distributor dirty. Remove and clean water distributor.
7. Inlet water valve leaks through during freeze cycle. Check water inlet valve.
8. Connected to hot water. Check for bleed through from missing check valve in building water supply.
9. Incomplete harvest. Check harvest system.
10.High pressure cut out opened. Check fan motor pressure control, check fan motor, check controller using test mode.
11. Fan motor pressure control open. Check fan pressure control.
12. Fan motor not turning. Check fan motor, check fan blade,check controller using test mode.
13.Water pump not pumping. Check pump motor,check controller using test mode.
14. Pump hose disconnected. Check hose.
15. Compressor not operating. check compressor contactor, check controller using test mode.
Check compressor start components, check PTCR resistance and temperature, check compressor voltage, check compressor windings.
16. Low refrigerant charge. Add some refrigerant and restart unit. If cycle time imporves, look for a leak.
17. Hot gas valve leaks through during freeze. Check hot gas valve for hot outlet during freeze.
18. Thermostatic expansion valve bulb loose. Check bulb.
19. Thermostatic expansion valve producing very low or high superheat. Check evaporator superheat, Change TXV if incorrect.
20. Compressor inefficent. Check compressor amp draw, if low and all else is correcy, change compressor.

Sep 28, 2013 | Scotsman Ice Maker CM3 30inW Cubed Ice...

1 Answer

Circuit breaker trips after water supply cycle


check the condensor fan in the compressor area and make sure its running if not the compressor will overheat causing high head pressures on the compressor causing it to draw too much current to operate the compressor and kick the breaker out,also make sure the condenser coils there are clean and it has ample air movement away from the wall

Apr 21, 2013 | Ice Makers

1 Answer

Mv450 scotsman high pressure


Check to make sure the condenser coil is clean, fan motor is running during freeze cycle. High Ambient temp, Ventilation, The higher the temperature entering the condenser coil the higher the head pressure. Fan motor failure, pressure switch failure. The cut out pressure varies 400, 450 or 500 PSIG. Water supply failure. not enough water running over the evaporator plate will cause high presser.

Jul 30, 2012 | Scotsman Cooled Modular Contour Cuber Air...

1 Answer

Scotsman cme456as-1a


Pull and clean water level switch. Check to see if water solenoid is getting power to it if so check to make sure you are getting water through it. FIRST check water filter make sure its not stopped up. if that is clear check make sure water line is not kinked. If your unit is not getting water then the unit will run high pressure and lock out on refrigeration.

Jun 14, 2012 | Scotsman Cooled Modular Contour Cuber Air...

1 Answer

Motor is hot?


Which motor is hot...compressor or fan?
Also need to know the model number.
Is this a 3-phase or single-phase unit?

Let's assume it is the compressor...Is it so hot that you can't touch it for more than a second or two? Is the compressor shutting down on internal thermal overload?

Compressor body hot can be caused by a number of things:
1. Low charge (the freon acts as a coolant for the compressor).
2. Electrical imbalance (3-phase only). (check line-to-line voltages)
3. Bearings in compressor failing (check amp draw).
4. Condenser dirty or airflow blocked in some way.
5. Condenser fan(s) not running or running backwards.
6. If water cooled condenser then water flow problem.

Hope this helps you get started.

If this helps you, please select YES to the first two ratings questions. Thank you, and Good Luck.




Oct 13, 2009 | Scotsman Ice Machine, Cuber, 1930 lb....

1 Answer

KM-450MAB making beaping noise-compressor will not run


The cleaning valve must be closed duing the ice making mode. If it is open, the machine will not make ice. The beeping you hear is the alarm which is present on the machine. Remove the front cover and read the included text. This will tell you what alarm you have.

Oct 07, 2008 | Hoshizaki Cubelet Ice MakerDispenser Water...

1 Answer

Model KM-450MAB--Ice Machine Making Beaping Noise


Keeps on beeping? Every 3 to 4 seconds? Try putting the thermostat wires together. An open bin thermostat will cause this problem and the board see it and starts beeping.

Oct 07, 2008 | Hoshizaki Cubelet Ice MakerDispenser Water...

1 Answer

Hoshizaki KM-450MAB Ice Machine


maybe not. it could be that the heating cycle is taking a lot of time to remove the ice from the evaporator that is why the electronics is shutting off the compressor as a protection. check the heating cycle if it is working fine. check the evaporator for dirt that would hold the ice slab from falling down quickly. check the level of the unit. it may have move and now its out of level. the unit must be leveled with the ground.

Feb 21, 2008 | Hoshizaki Cubelet Ice MakerDispenser Water...

1 Answer

Km 452 dwu


See if it has any pressure in the sealed system. If so its probably ok.

Water cooled machines here in Oklahoma have to have a new water valve about ever 2 to 3 years or water will flow all the time. The plus is you can install it in a hot kitchen or garage and it will continue to make ice. The bad thing is it takes a lot of water.

If your inclined you could set up a cooling tower and spray the water out and collect it back in the sump and push it back in to the condenser with a pump. If your in Arizona this might be a cure for water use. Other wise get ready for a mess if you don't pipe it into the drain on the building. Keeps the misquotes happy though.

Nov 02, 2007 | Hoshizaki Cubelet Ice MakerDispenser Water...

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