Question about U-Line Icemaker

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Ice machines compressor runs extremely hot.

Ice production exceeds predicted production. Refrigerants are at the proper level. What could the problem be?

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This looks to be a Scottsman Ice machine so could be that your condenser fan motor isn't running or you need to clean the condenser which either of these could cause the compressor to be extremely hot. If it is over producing ice then you could try to turn down the bin level. If this doesn't fix your problem with over production then you may need to replace the bin level thermostat which can be located at the bottom of the machine. It is the one that has the knob on it. The other thermostat behind the control cover is the cube size control which routes to the back, top of the machine. The bin level control routes around under the bottom between the compressor and the case, then up and into the back of the cabinet. The silver colored scoop holder inside the machine to the right is where the bin level thermostat registers it's temperatures. It's not just a scoop holder. Let me know if you need more help. Thanks.

Posted on Apr 02, 2009

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If condenser is clean and fan is running check amp draw on compressor

Posted on Apr 20, 2012

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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.

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Is the wiring correct? Fan runs when condenser is hot / high pressure not just when compressor runs so check condenser sensor.

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The QYO604A uses r404A with a 28 oz. charge. The fan cycles for a couple different reasons. First, when the unit goes into harvest mode, it is the hot gas that allows the surface tension of the ice to plate to be broken allowing the sheet of ice to drop. It does not have the required btu capacity to do this in a timely manner with the fan running, and cycling it off allows the machine to provide a greater heat capacity to the evaporator. Second, in a properly charged machine WITH A GOOD COMPRESSOR, meaning the valves are not shot, unless it is extremely cold the fan will stay on and if it is that cold the machine is probably in a poor location. The fan cycler is a 200 psi open and 250 psi close. There are reasons the fan is intermittent also and usually this is due to a faulty switch, which after 10 years or so can fail from an electrical mechanical standpoint. I have seen the switch terminals loose and very tricky on diagnosing due to the nature of the symptoms. If your reading 200 off and 250 on then the switch is good and look at low charge, starving tev, bad compressor valves. You failed to mention what the state of production is. Normal rated, low or almost non existent. This also is part of the diagnosis. Good luck.

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1 Answer

Unit cools great but when extremly hot weather occurs it eventually freezes up.


dirty filters in the indoor unit.As the ambient temperature rises the unit will work harder and longer,its fine when its just a normal day because the evaporator coil wont have time to ice up as the compressor will cycle off before the coil freezes totally,but during extreme ambient temperatures the coil will ice up as the compressor will continue running to reach set-point causing the coil to ice up

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1 Answer

Unit makes ice,full evaporator,is very slow,maybe 45 mins. from harvest to harvest. Why so slow?


Possible causes are many
Things to check
  • If air cooled, is the condenser coil clean and is the condenser fan running when in ice production ? Is the area extremely hot where the ice machine is located? If water cooled, is there adequate water pressure and is the water regulating valve set properly?
  • When the system switch is in the off position is there any water running ( if so the inlet water valve may be stuck open)
  • When in ice production, is the small tube that feeds from the hot gas solenoid hot? This tube comes from a valve at the back of the unit and feeds over the compressor and into a tee near the insulated Tx valve. This line should be hot during harvest and cool shortly after harvest.
  • Has the float switch assembly been cleaned. this is a cylindrical unit beside the water pump,It can get plugged with minerals and not initiate harvest
  • The system may have a refrigerant charge problem (short) or the compressor may be weak, at which point diagnosis would need to be done by a refrigeration tech
Hope this helps

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1 Answer

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