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

My ice machine is making a beaping noise. When the cleaning valve is open the noise goes away but the compressor will not operate. The manual says the valve must be in the closed position in the ice making mode.

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  • amimichele Oct 22, 2008

    Wow! Same problem, did we get them from the same guy?

  • tdarty Oct 25, 2008

    i hear 3 beeps and so i cleaned the filter checked out the condenser . i reset the the reset button and the beeps went away i dont hear the compressor comeing on

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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.

Posted on Feb 20, 2009

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I have a Scotsman CME 506 ice maker. After running a cleaning cycle it won't run. After resetting the freeze light blinks and nothing happens. The water inlet valve never opens (the sump is current


CM3 Operational Sequence.
From Off, push and release the freeze button.
1. If sump is full,water pump starts.If sump is not full,water valve opens to fill it.
2. Compressor starts when sump is full.Air cooled fan motor starts too.
3. water pump stops early in freeze cycle for 30 seconds.
4. Sump refills after pump starts.
5. In low ambient condition,fan motor may begin to cycle on and off.
6. Freeze continues until water level in sump drops to preset point. Exceptions: SCE275 must fill sump two more times.
7. Fan may shut off before the end of freeze.
8. Harvest begins. Hot gas valve opens,pump stops.
9. Pump restarts, inlet water valve opens to fill and overflow the reservoir.
10. Harvest continues for preset first cycle harvest time.
11. If bin is not full, cycle repeats ( compressor stays on). If bin is full, unit shuts off at the end of harvest.
OK with that out of the way unless you unplugged any wires cleaning the machine should not have caused any problems. First cut off water and pull water supply line from water inlet valve look in the end of valve there is a screen in there it could be stopped up. If the valve screen is not stopped up then put supply water line back on and turn water back on. power the CM3 controller off. push freeze button. now with a voltage meter check at the water inlet valve to make sure you are getting power to the valve.If you are then either valve is stopped up or valve is bad. If you are not getting power to valve then replace the CM3 controller now make sure the bin full light is not on because if it is this will not let controller go back to a freeze cycle.

Oct 28, 2014 | Ice Makers

1 Answer

Need to know how to fix a csw 45 Scotsman ice making machine


Hi, first make sure the switch is not in the clean position but to on. If it is in the on position and the water is circulating over evaporator plate and is running back into the water sump tray and compressor is running as you stated then check to make sure the hot gas valve is not letting hot gas leak through during freeze cycle, the way you can check is after start up wait about 5 minutes and check the temp entering the hot gas valve and the temp on the other side of the valve if temp is the same then valve is bad. The next thing to check is the refrigerant level this only can be done by adding service valves and weighing out the charge to see if it is low, if low then there is a leak. The freeze cycle is as follows. The compressor, fan motor and water pump are all operating and stay in a freeze cycle until the evaporator thermistor reaches 6.5 deg F. That signals the control board to place the unit into a harvest cycle.

Oct 02, 2014 | Scotsman CSW45 15" Ice Maker with 26 lb....

2 Answers

Short freeze


Ice is to thin. Check to make sure water inlet valve is not letting water go through valve during freeze cycle. Make sure condenser coil is clean and condenser fan is running. Check the hot gas valve to make sure it is not bypassing during freeze cycle.

Apr 15, 2014 | Scotsman C0630MR_HD30B-32 684 lb 30"...

1 Answer

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

I have a franklin chef fim400 ice maker that cycles but will not make ice. What could be wrong?


you may want to add shader valves using saddle type that just compresses on and check charge if low then find and repair leak and recharge but be careful these type ice machines are very touchy on charge so go slow

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2 Answers

Manitowoc QY1304A Ice Machine Compressor will not start


Does the compressor make any noise at all?

You can ohm out the compressor windings. I dont know off the top of my head which compressor manufacturer they are using but if it is Copeland you can get an electrical handbook and it will have ohm values for the compressor. If not assume the rule of thumb Common to Run is X, Common to Start is Y, Start to Run is X+Y, and Y should be 3 to 5 times whatever X is. On Rx10,000 scale check each terminal to ground should be open.

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1 Answer

Compressor starts then shuts down like head pressure building to high


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

Nov 05, 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...

3 Answers

Marine ice maker


compressor is bad.

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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...

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