To manually defrost a frozen evaporator coil, what should technicians use?

Using a heat gun to accelerate the melting of ice on a frozen evaporator coil is an effective method for manual defrosting. Heat guns provide controlled, concentrated heat that can effectively melt away the ice without causing damage to the components of the refrigeration system. This approach allows for the safe and efficient removal of frost build-up that can hinder the appliance's performance.

The application of direct heat from a heat gun facilitates a faster defrosting process compared to other methods, which can take longer and may increase the risk of damage. By carefully directing the heat onto the frozen areas, technicians can carefully monitor the process, ensuring that they do not overheat or damage the coil itself, which is critical for the efficiency of the cooling system.

This method also reduces the chances of introducing additional water, which could lead to further complications or issues if not managed properly. In contrast, some alternative methods outlined in other choices might involve risks that could damage the evaporator coil or do not provide the same level of efficiency.