Troubleshooting and customer service
The unit and components are manufactured using state-of-the-art production methods and tested several
times to verify that they function correctly. However, if malfunctions should occur, please check the functions
as detailed in the list below. With systems for cooling or heating with indoor units, chillers or heating systems
the chapter "Troubleshooting and customer service" in all operating manuals must also be observed. Please
inform your dealer if the unit is still not working correctly after all function checks have been performed!
Operational malfunctions
Malfunction
Possible cause
Check
Remedial measures
The unit does not start
or switches itself off.
Power failure, under-voltage.
Does all other electrical
equipment function correctly?
Check the power and wait for it
to come back on if necessary.
Mains fuse faulty.
Master switch off.
Are all lighting circuits
functioning correctly?
Replace the mains fuse.
Switch on the master switch.
Power supply damaged.
Does all other electrical
equipment function correctly?
Repair by specialist firm.
Waiting time after switching
on too short.
Does a restart occur after
around 5 minutes?
Plan for longer wait period.
Operational temperature range
too low or exceeded.
Are the fans in the indoor unit
and outdoor unit working correctly?
Observe temperature ranges
of indoor unit and outdoor unit.
Power surge due
to thunderstorm.
Have there been any lighting
strikes in the area recently?
Turn the main fuse off
and turn it on again. Inspection
by certified service centre.
External condensate pump
alarm.
Has the pump shut down due
to a malfunction?
Check the pump and clean it
if necessary.
Heating mode:
Minimum heat exchanger
temperature not reached
Is the unit in the warm-up
or cool-down phase (see
"Malfunction indicated by
flashing code")?
Check or increase the inlet
temperature.
The unit does
not respond
to the remote control.
Transmission distance too large /
receiving problem.
Does the indoor unit beep when
pressing a key?
Reduce the distance to less
than 6 m and change location.
Remote control is faulty
Is the unit running in manual
mode?
Replace remote control.
Receiver and transmitter are
exposed to too much sunlight.
Does it function correctly
in the shade?
Shade the transmitter
and receiver.
Electromagnetic fields disrupt
the transmission.
Does it function after
removing potential sources of
interference?
Signal is not transmitted when
interference sources
are operational.
Key on remote control stuck /
dual key operation.
Does the "Transmitting" symbol
appear on the display?
Release the key / press only
one key.
Batteries of remote control
are flat.
Have new batteries been
inserted? Is the display
incomplete?
Insert new batteries.
Please note that this "Troubleshooting table" continues on the next page!
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