Unusual noise from fans or AHUs — grinding, squealing, or rumbling sounds.
Increased vibration felt or measured at fan or AHU housing.
Reduced airflow from supply or extract terminals.
Higher than normal motor running current (detectable during PPM).
Visual belt wear, cracking, glazing, or fraying on inspection.
Elevated bearing temperature detected by thermal imaging.
Do not wait for a full breakdown. Bearing and belt replacement is a low-cost, fast repair when caught early — but can result in motor burnout, shaft damage, and full fan replacement if ignored. Contact CVAC International to arrange an inspection or emergency repair.