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Troubleshooting and customer service
Malfunctions
The equipment and components are manufactured using state-of-the-art production methods and tested sev-
eral times to verify their correct function. If malfunctions should occur, please check the functions as detailed in
the list below. For installations with an indoor unit and outdoor unit, refer to the chapter "Troubleshooting and
customer service" in both manuals. Please inform your dealer if the unit is still not working correctly after all the
functional checks have been performed!
Fault Possible cause Checks Remedy
The unit does not start
or switches itself off
off.
Power outage, undervoltage, defec-
tive mains fuse / main switch in off
position
Are all other electrical installations
functioning correctly?
Check voltage if necessary wait
until turned on again.
Damaged mains cable
Are all other electrical installations
functioning correctly?
Repair by a specialist
Wait time after switching on is too
short
Have approx. 5 minutes
elapsed since the restart?
Schedule longer waiting periods
Temperature outside operating
range.
Are the fans in the indoor unit
and outdoor component working
correctly?
Take into account the temperature
range for the indoor unit and out-
door component
Electrical surges caused by thun-
derstorms
Have there been lightning strikes in
the area recently?
Switch off the mains breaker and
switch it back on. Have it checked
by a specialist
Fault in external condensation
pump
Did the pump shut down due to
a fault?
Check and if necessary clean the
pump
The unit does not respond
to the remote control
Transmission distance too far /
receiver affected by interference
Does the indoor unit beep when
pressing a button?
Reduce the distance to less than 6
m or change position
Defective remote control
Is the unit running in manual mode?
Replace the remote control
Receiver or transmitter unit ex-
posed to excessive solar radiation
Does it function correctly in the
shade?
Place the receiver & transmitter unit
in the shade
Electromagnetic fields are interfer-
ing with transmission
Does it function when switching off
possible sources of interference?
Signal is not transmitted when
interference sources are operational
Button in remote control jammed /
two buttons pressed at same time
Does the “Send” symbol appear
on the display?
Release the button / press only one
button
Batteries in remote control are flat
Have new batteries been inserted?
Is the display incomplete?
Insert new batteries
The unit is running with
reduced or without
cooling / heating output
Filter is unclean / air inlet / outlet
blocked by foreign objects
Have the filters been cleaned? Clean the filters
Windows and doors open. Heating/
cooling loads increased
Have there been any structural /
usage-related changes?
Close windows and doors / install
additional units
Neither cooling nor heating mode
has been set
Does the cooling symbol appear on
the display?
Correct the settings for the unit
Fins on outdoor component
blocked by foreign objects
Is the fan on the outdoor com-
ponent running? Are the fins
unobstructed?
Check the fan or winter controller,
reduce the air resistance
Leaking refrigerant circuit
Are there signs of frost on the fins
of the indoor unit?
Repair by specialist
Outdoor component iced up
Check outdoor component.
Has the cassette sensor on the
outdoor component been correctly
positioned?
De-ice and fit the sensor at the
point where the most ice forms
Condensation discharge
on unit
Drainage pipe on collection con-
tainer clogged / damaged
Can the condensation drain off
without any obstruction?
Clean the drainage pipe and collec-
tion container
Faulty external condensation pump
or float
Is the collection tray full of water
and the pump not running?
Call out a specialist to replace the
pump
Condensation has not drained away
and has collected in the condensa-
tion line
Is there a steady fall on the con-
densation pipe? Check there is no
blockage in the pipe.
Ensure there is a fall when laying
the condensation pipe and clean
the pipe.
Condensation does not drain off
Are the condensation lines un-
blocked and laid on a slope? Are the
condensation pump and float switch
functioning correctly?
The condensation line must have
a fall. If necessary, clean the pipe.
A faulty condensation pump and
float switch should be replaced.
Float is stuck or jammed due to
excessive dirt.
Are the LEDs on the receiver unit of
the indoor unit flashing?
Should be cleaned by specialist firm
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