2026-05-14 ● A fan coil unit should be serviced regularly to maintain airflow, coil efficiency, drainage, and control accuracy. ● Full fan coil unit service includes filter cleaning, coil inspection, drain cleaning, fan checks, and control testing. ● Service frequency depends on dust level, humidity, occupancy, and operating hours. ● Concealed fan coil units, floor/ceiling fan coil units, and cassette fan coil units require similar core maintenance with different access methods. ● A neglected fan coil unit may develop weak airflow, leakage, odor, noise, and higher energy use.