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Troubleshooting table
MALFUNCTION TYPE
NOISE LEVEL
INSUFFICIENT AIR FLOW
EXCESSIVE AIR FLOW
INSUFFICIENT THERMAL EFFI-
CIENCY
WATER LEAK
62
COMPONENT
Fan impeller
Transmission
Bearings
Motor
Ducts
Ducts
Filters
Heat exchange coils
Ducts
Unit
Coil
Electric pump
Fluid
Fan section
POSSIBLE CAUSE/SOLUTION
Impeller deformed, unbalanced or loose
Nozzle damaged
Foreign bodies in the fan
Motor or fan not attached well
Bearing worn or deteriorated
Incorrect supply voltage
Worn bearings
Contact between the rotor and stator
Excessive speed in the ducts
Anti-vibration joint too taut
Load losses superior to the demand
Dampers closed
Obstructions in the ducts
too dirty
too dirty
Load losses inferior to the demand
Ducts too large
Terminals not installed
Filters not inserted
Access doors open
Access doors open
Incorrect connection of inlet/outlet piping
Coil dirty
Air bubbles in the pipes
Excessive air flow
Insufficient water flow
insufficient pressure
Wrong direction of rotation
Temperature different from the project
Incorrect regulation bodies
Leak from the coil due to corrosion
Dragging of drops due to high air velocity
Clogged "overflow" drain
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