12
TROUBLESHOOTING
Table 3
Fault
Possible reasons
Fault handling
The fan does not
start up during
the unit start-up.
No power supply.
Make sure that the unit is properly connected to power mains and make
any corrections, if necessary.
Motor is jammed, the impeller are clogged.
Turn the unit off . Troubleshoot the motor jam and the impeller clogging.
Clean the blades. Restart the unit.
Automatic
switch tripping
following the unit
turning on.
Overcurrent resulted from short circuit in the
electric circuit.
Turn the unit off . Contact the service centre.
Low air fl ow.
Low set fan speed.
Set higher speed.
The fi lters, the fans or the heat exchanger are
dirty.
Clean or replace the fi lter, clean the fans and the heat exchanger.
The ventilation system components (air ducts,
diff users, louver shutters, grilles) are clogged or
damaged.
Clean or replace the ventilation system components, such as air ducts,
diff users, louver shutters, grilles.
The air dampers, diff users or the louvre shutters
are closed.
Make sure the air dampers, diff users or the louvre shutters are fully
opened.
High noise,
vibration.
The impeller(s) are soiled.
Clean the impeller(s).
The screw connection is too loose.
Tighten the fan or casing screw connection against stop.
No anti-vibration dampers.
Install anti-vibration rubber mounts.
Water leakage.
The drain pipe is clogged, damaged or wrong
mounted.
Clean the drain line, if necessary. Check the drain line slant, inspect the
U-trap and make sure the drain line is equipped with frost protection.
Possible faults and troubleshooting
STORAGE AND TRANSPORTATION RULES
Store the unit in the manufacturer’s original packing box in a dry ventilated premise at the temperatures from +10 °C up to +40 °C.
Storage environment must not contain aggressive vapours and chemical mixtures provoking corrosion, insulation and sealing
deformation.
Use hoist machinery for handling and storage operations to prevent the unit damage. Fulfi l the handling requirements applicable
for the applicable freight type.
Transportation with any vehicle type is allowed provided that the unit is protected against mechanical and weather damage. Avoid
any mechanical shocks and strokes during handling operations.
