I have a Manitowoc ice maker Series 150 Model BY0154A. It shut off and now will not stay running

SOURCE: i have a model qd0452a manitowoc and it will not

Very unusual for one of these to not stop. There is a magnetic proximity switch located on the bottom right side of the water curtain that serves to both cancel a harvest/drop and to shut the unit down on a full bin. When a drop occurs the control board sees a open and then close of the switch and restarts a freeze mode. If the ice drops and the bin is full the curtain is blocked by the ice behind it from closing again and the unit shuts down on a full bin indication. If the curtain does not open and close after 3 hours it would lock the unit out. Therefore I assume that the switch and the board are working. Most likely you either have the unit on a non-Manitowoc bin or are missing a deflector plate in the Manitowoc bin and the ice is falling out of a service door.

SOURCE: manitowoc ice maker does not produce ice

If it doesn't run at all open the front panel and peer inside of the control box. See if there are any indicator lights on the control board lit or blinking. Check the plastic water curtain on the machine and make sure that the magnet is in place on the bottom right. Will need more information as to what lights are lit. Printed on the board next to each light is its corresponding function or response.