Is the clean light lit solid or flashing. What color is it? Is the service light lit or flashing red? When was the machine last cleaned? Requires Manitowic cleaner and sanitizer. And some disassembly. Should be done by a licensed refrigeration tech.
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To totally reboot the machine, press the OFF button for 3 seconds.. Wait for the ice to melt off the evaporator. Disconnect the power to the machine for 10 seconds. Repower the machine and press the ON button. It should light blue.
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You should have a UDO240AE, not a UDO240A because you stated in a earlier post that you have 50 cycle power. Make sure the unit has a good ground.