Have you cleaned condenser thoroughly?
Have you cleaned all air filters?
Have you checked date of water filter and replaced if date runs out within 6 months? Ensure that you flush through with water for 5 minutes and add date that it needs to be replaced.
Have you cleaned inlet water filter in solenoid?
Have you removed and cleaned out water tank and refitted?
Have you de-scaled with 'ice machine cleaner'? Ensure that you wear the correct PPE and that all ice is discarded.
Have you checked and recorded ice production per hour? Run machine for 15 minutes and weigh ice and times it by 96, it should be around 375-400.
Have you cleaned the externals of the ice machine?
Have you checked all drains are clean/flowing and clear of leaks?