When a technician finds that an ice machine's condenser water circuit has a thin layer of mineral deposits, the technician should do what?

Flushing the water circuit with a scale remover is the appropriate action when a technician discovers a thin layer of mineral deposits in an ice machine's condenser water circuit. Mineral deposits can accumulate due to hard water, leading to reduced heat transfer efficiency, overheating, and potential system failure. By using a scale remover, the technician can effectively dissolve and remove these deposits, restoring the efficiency of the cooling system and prolonging its operational lifespan. This maintenance step is crucial for ensuring the machine operates at optimal performance levels and avoids further complications related to buildup.

The other options do not address the root cause of the problem. Replacing the condenser would be unnecessary if the issue can be resolved through cleaning. Increasing refrigerant flow does not target the mineral deposits and could lead to additional problems, such as overloading the system. Changing the water supply may be an option to consider for long-term solutions, but it does not provide an immediate fix to the current accumulation of deposits. Thus, utilizing a scale remover is the most effective and responsible course of action in this scenario.