21
VUT EH
VUT EH
TROUBLESHOOTING
Table 5
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.
System alarm.
Troubleshoot the system alarm. 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 lters, clean the fans and the heat exchanger.
The ventilation system components (air ducts,
diff users, louvre shutters, grilles) are clogged or
damaged.
Clean or replace the ventilation system components, such as air ducts,
diff users, louvre shutters, grilles.
The air dampers, air diff users or the louvre
shutters are closed.
Make sure that the air dampers, the diff users or the louvre shutters are
fully opened.
Low supply air
temperature.
The extract fi lter is soiled.
Clean or replace the extract fi lter.
The heat exchanger is frozen.
Check the heat exchanger condition. Turn the unit off and restart it after
the freeze danger is no longer imminent.
The electric heater malfunction.
Contact the service centre.
High noise,
vibration.
The impeller(s) are soiled.
Clean the impeller(s).
The screw connection is too loose.
Tighten the screw connection against stop.
No anti-vibration dampers.
Install anti-vibration mounts (not included into the delivery set).
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 a dry and clean weather-protected premise in the manufacturer’s original packing box. Protect the unit against
environmental exposure and dirt ingress until fi nal unit. The unit storage above one year is not recommended. Keep the duly ambient
temperature and humidity in the storage environment. Connection to power mains is allowed only after the unit is kept indoor at
least for 2 hours at room temperature. 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.
Summary of Contents for VUT 1000 EH
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