Working on a Manitowoc BDO452A ice machine. The machine runs 2 batches of ice perfectly then on the 3rd cycle the unit cuts out as soon as the machine goes in to harvest.
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In addition to the standard safety controls, your
Manitowoc ice machine features built-in safety limits
that will stop the ice machine if conditions arise which
could cause a major component failure.
Before calling for service, re-start the ice machine
using the following procedure:
1. Move the ON/OFF/WASH switch to OFF and then
back to ON.
2. If the safety limit feature has stopped the ice
machine, it will restart after a short delay.
If the ice machine stops again, the condition
has reoccurred. Call for service.
Liquid line sensor on ice machines in general is used in conjunction with the control boards to determine defrost and harvest cycles. You could measure the line temp and chech the resistance of the sensor to check it.
Chances are the unit is shutting down on an error code. It will shut down after three batches if either A: the unit takes too long to make ice, or B: a harvest cycle lasts too long. You can time a batch of ice with a timer or stopwatch... if you listen you should be able to tell when the "ice making" stops and the "harvesting" begins. Ice making should take about 13-15 minutes and harvesting 1.5 to 2.5 minutes. If I remember correctly the error codes are triggered if the ice making takes 60 minutes or longer and/or the harvest takes 3 minutes or longer. You can tell which error code is tripping by accessing the electronic control board. There is an LED indicator that will blink when you turn the unit on if there is an error present in the memory.
check the cycle time for a batch of ice. should take around 15 minutes to freeze and then you will hear the harvest cycle kick in. If the harvest cycle takes 3 minutes or more that is your problem. You will need to get a hold of NICKEL SAFE ICE MACHINE CLEANER. DO NOT use CLR or any kind of cleaner other than NICKEL SAFE ICE MACHINE CLEANER. If the ice doesn't fall off of the plate in about 90 seconds either the plate is dirty or the nickel plating has come off. There is a failsafe shut down if the unit takes more than 60 minutes to freeze or more than 3 minutes to harvest 3 consecutive times. The cleaning instructions should be inside of one of the covers. If not it's available online.
Which code is that? I don't see that in the service manual. There is an E09 that indicates that during the first six minutes of freeze the discharge temperature was below the average of the last 6 cycles. I have searched from E01 to E31 and don't see the code you indicate but I would say you either have a low refrigerant charge, a flooding TXV that is allowing too much refrigerant flow into the evaporator and not allowing enough flow to be diverted into harvest, or a weak compressor. Reset the unit and check the temperatures on the display while its running and time a freeze cycle. Should take about 15 minutes to make ice.
Sounds like a bad headmaster valve, bad fan motor, or bad pressure cycling switch for the fan motor. Will need to know operating pressures to troubleshoot. Not really a DIY job unless you have some experience.
This is a Manitowoc model QY0214A. The water tough starts to slush up after about 3 minutes after start up cycle. The slush prevents water from flowing to the pump for circulation.
What can be wrong?
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