20
Split Type User Manual
9 Troubleshooting
The table below describes a selection of problems with
their possible causes and solutions, see Table 9.1.
If these solutions do not solve the problem contact your
usual installer or call your nearest Vaillant office.
SYMPTOMS
POSSIBLE CAUSES
POSSIBLE SOLUTION
The system does not restart immediately
When unit is stopped, it won't restart until 3
minutes have elapsed to protect the system
Wait 3 minutes before starting the unit again
When the electric plug is pulled out and
inserted again, the protection circuit will
work for thee minutes to ptotect the air
condioner unit
Wait 3 minutes after inserting the plug and
before starting the unit again
The system does not work at all (the
ventilation does not start)
The power plug is not inserted
Insert the plug and start the unit by
positioning the selector to "I" (start)
Power supply cut
Reconnect the power supply
The fuse has blown
Replace the fuse. Only use the right fuses
for each model. Do not use wire or other
material to replace the fuse. Fires could be
caused
Insufficient cooling or heating
Doors and/or windows open
Close the doors and/or windows
Heat source nearby (e.g. lots of people in the
room)
If possible, remove the heat source
The thermostat is set to an excessively high
temperature in cooling mode or excessively
low temperature in heating mode
Set the temperature properly
Obstacle in front of the air inlet or outlet
Remove the obstacle to allow the air to
circulate properly
The ambient temperature has not reached
the designated level
Wait for a few moments
Dirty or blocked air filter
Clean the air filter (the air filter should be
cleaned every 15 days)
Is there any direct sunlight through the
window during the cooling operation?
Use a curtain to protect the air conditioning
unit
Noise is heard
During unit operation or when stopping the
unit a gurgling noise may be heard. This
noise is more audible the first 2-3 minutes of
operation
This is normal in an air conditioning unit.
The noise is caused by the refrigerant
flowing in the system).
A cracking noise is heard during operation
This is normal in an air conditioning unit.
The noise is caused by the casing expanding
or shrinking due to the temperature changes
If the noise is loud and comes from the air
flow during the unit operation, the air filters
may be too dirty
Clean the air filters properly
Smells are generated
This is because the system circulates smells
from the indoor surrounding (furniture,
cigarettes)
This situation does not require any action
Mist or steam come are blown out from the
unit
During COOL mode or DRY mode operation,
the indoor unit may blow some mist. This is
due to the sudden cooling of the indoor air.
This situation does not require any action
Table 9.1 Troubleshooting.
9 Troubleshooting
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