I am working on a Cornelius, model # IAC 530, ice machine that fails, always at night, when it fails the red led is on on the circuit board and power has to be cycled for it to start again.
I can find nothing wrong with the operation of the machine when it is working. I have changed the circuit board and the suction temperature probe. I unplugged the pump and found that that caused it to lock out after two cycles, so I changed the pump. It still locks out at night.
As far as I can tell by reading the literature the only thing that will cause it to lock out is if the suction temp gets below -28 degrees or if the ice screen does not open for two cycles.
I now find out that one of our other refrigeration guys ran into the same thing in another building a couple of years age. They had another ice maker in storage so he just swapped it out and never did find out what was wrong.
This machine works so well when it is running that I can't believe that this cannot be fixed.