RELAY

Technicians ordering part 18-1903-33 are typically replacing the relay in an ice machine system. It is generally replaced when the original part is worn, damaged, electrically weak, or no longer performing its normal function in the machine. Before purchase, compare the machine brand and the removed part markings to avoid ordering a visually similar but incorrect item. If your machine has multiple production revisions, confirm the exact model and serial details before finalizing the order. Helps the circuit start and switch loads correctly when the machine is not starting, clicking, or short cycling. When this component fails, technicians may see issues such as intermittent operation, clicking but not starting, and compressor not engaging. Relay or contactor faults can interrupt startup and cycling, especially when contacts are worn or the coil becomes unreliable. For this relay/contactor category, the typical repair goal is to restore the function that the failed component was affecting. During diagnosis, the part number should be matched first, then the circuit or assembly should be tested to confirm the failure path. Relay diagnosis usually includes continuity checks, contact inspection, and verification that the controlled load is not causing arcing or chatter. If the machine has a history of intermittent faults, reviewing recent service notes can help confirm whether this component is the primary failure. Replacing a failed component with the correct part number helps restore normal operation, reduces repeat callbacks, and supports more reliable troubleshooting outcomes. The best results come from matching the part number to the machine and replacing it only after the failure has been confirmed. Symptoms such as not turning on, no power, not cooling, not starting, intermittent operation, error code faults, or ice not dropping may point to this part category, but technicians should verify the complete failure path to make the repair stick.