A defrost timer is an important part of any commercial ice machine. It runs constantly to prevent ice formation on the evaporator when the refrigerator is being used. When ice accumulates it hinders the formation of ice in the machine or even the production of ice at all. This can lead to inefficiency and costly repairs. In response to this, the defrost timer initiates a defrost cycle. https://www.partsfe.co.uk/ice-machine-parts/defrost-timers