Adler ice maker displays E20; unit indicates a cleaning required or maintenance overdue condition.

Safety first: Disconnect power and close the water supply valve before cleaning.

• Perform full cleaning: Follow the Adler cleaning procedure using an approved ice machine cleaner. Clean the reservoir, evaporator plate, water distribution system, and bin.
• Sanitize: After descaling, run a sanitizing cycle with an Adler-recommended sanitizer to kill biofilm and bacteria.
• Rinse thoroughly: Flush the system with fresh water until no cleaner or sanitizer remains.
• Clean filters: Replace or clean the Adler inlet water filter and any internal screens.
• Reset maintenance indicator: Use the control panel sequence described in the Adler manual to reset the E20 maintenance reminder.