I have a Manitowoc mod# IY0524A-161 that goes into error E02 long harvest. Check temps., pressures, freeze times (12-15 min. depending on how I set bridge thickness). Everything is fine when operating, it will not go into error when I'm there. It may run a day or two until it goes into error. Staff is getting tired of resetting it. It's at our north location so I can't be there to babysit it to often. Machine is clean, harvest time when i'm there is about 45sec., cubes look good, air valve is operational. anybody out there have this intermitant problem?
I've had the harvest motor or the solenoid (dependoing on how Mani does em', act out randomly.
I mainly work on Scotsman but I can't believe they would be too different, it can be a bad curtain sensor which would be fairly obvious if you opened and closed the curtain and looked at the LED's on the board (I'm assuming it's similar to Scotsman)
You can also check if the grid is loose, run your finger horizontally and vertically and if they move or rattle, some of the grids have seperated and this causes the ice cube to freeze behind the grid, essentially locking the entire batch in place.
If it has a manual harvest button, try pushing it and watch what the harvest assist mechanism does, sometimes they burn out, I've had one get stuck.
Harvest issues can be the most frustrating, sometimes it also takes finding a sweet balance on the thickness, I find it's not always best to have it so thick depending on the piece of equipment.
Be aware that this machine had water problems with water going behind the evaporator and the freeze cycles popping the refrigeration coils off the evaporator. Then having partial (uneven Ice) freezing of the plate and delayed defrost. Make sure the water manifold is correctly reassembled and the ice plate is sealed in the top back of the water grid. Make sure to use only Manitowoc cleaner on this one. Be very careful with cleaning the bridge sensor and reassemble of the spray bar. If the bridge sensor is not clean, It will cause a problem
It comes from the top where the spray bar is mounted not being fully sealed to the evaporator. You can not easily see the back of the evaporator, But repeated leaking and the freeze/ thaw cycles tend to break the tubing loose at the top. I've had to trash a few of them.