An ice maker for forming ice having a refrigeration system, a water system, and a control system. The refrigeration system includes a compressor, a condenser, and an evaporator. The water system includes a water filter and a sump to hold water to be made into ice. The control system includes a controller adapted to determine a baseline freeze time, a baseline harvest time, and/or a baseline fill time after an initial set of ice making cycles and is further adapted to compare subsequent harvest times, freeze times, and/or fill times to the baseline freeze, harvest, and/or fill times to determine whether the ice maker needs maintenance. If controller determines that ice maker needs maintenance, controller can push a notification to a portable electronic device connected to the ice maker.