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11
Troubleshooting, fault analysis and customer service
11.1
Troubleshooting and customer service
The unit and components are manufactured using state-of-the-art production methods and tested several
times to verify their correct function. However, if alarms should occur, please check the functions as detailed
in the list below. For systems with an indoor unit and outdoor unit, refer to the chapter "Troubleshooting and
customer service" in both operating manuals. Please inform your dealer if the unit is still not working correctly
after all function checks have been performed!
Operational malfunctions
Malfunction
The unit does not start or
switches itself off.
The unit does not
respond to the remote
control
Possible causes
Power failure, under-
voltage, defective mains
fuse / main switch in
OFF position
Damaged power supply
Wait time after switching
on is too short
Temperature outside
operating range.
Electrical surges caused
by thunderstorms
Malfunction of the
external condensate
pump
High-pressure / low-pres-
sure switches have trig-
gered
Transmission distance
too far / receiver affected
by interference
Defective remote control
Receiver or transmitter
unit exposed to exces-
sive solar radiation
Electromagnetic fields
are interfering with trans-
mission
Key in remote control
jammed / two buttons
pressed at same time
Batteries in remote con-
trol are flat
Checks
Does all other electrical
equipment function cor-
rectly?
Does all other elec.
equipment function cor-
rectly?
Have approx. 5 minutes
elapsed since the
restart?
Are the fans in the indoor
unit and outdoor unit
working correctly?
Have there been light-
ning strikes in the area
recently?
Has the pump shut down
due to a malfunction?
Check refrigerant pres-
sure and look for leaks if
necessary
Does the indoor unit
beep when pressing a
key?
Is the unit running in
manual mode?
Does it function correctly
in the shade?
Does it function after
removing potential
sources of interference?
Does the "Transmitting"
symbol appear on the
display?
Have new batteries been
inserted? Is the display
incomplete?
Remedial measures
Check the voltage and if
necessary, wait for it to
come back on.
Repair by specialist firm
Schedule longer wait
times
Observe temperature
ranges of indoor unit and
outdoor unit
Switch off the mains
breaker and switch it
back on. Have it
inspected by a specialist
Check and if necessary
clean the pump
Rectify leakage and re-
start
Reduce the distance to
less than 6 m or change
position
Replace the remote con-
trol
Place the receiver and/or
transmitter unit in the
shade
Signal is not transmitted
when interference
sources are operational
Release the key / only
press one key
Insert new batteries
45
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