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11 Troubleshooting and customer service
11.1 Troubleshooting
The unit and components are manufactured using state-of-the-art production methods and tested several
times to verify their correct function. However
, if malfunctions 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 "Trouble-
shooting 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 Possible causes Checks Remedial measures
The unit does not
start or switches
itself of
f
Power failure, under-
voltage,
Does all other electrical
equipment function cor-
rectly?
Check the voltage and if
necessary
, wait for it to
come back on
Defective mains fuse /
main switch turned of
f
Are all lighting circuits
functioning correctly?
Replace mains fuse,
switch main switch on
Damaged power supply
Does all other elec. equip-
ment function correctly?
Repair by specialist firm
Wait time after switching
on is too short
Does a restart occur after
around 5 minutes?
Schedule longer wait times
Operational temperature
range too low/exceeded
Are the fans on the units
still working?
Observe temperature
ranges
Over-voltage or under-
voltage at times
Check by specialist firm
Switch the system off and
back on
Condensate pump's
switch-of
f contact opened
Is the external condensate
pump on the indoor unit
showing "Malfunction"?
Clean the condensate
pump's outlet. Have the
pump replaced
The unit works at
reduced or no
cooling capacity
.
Air inlet and / or air outlet
opening blocked by debris.
Debris in air inlet and air
outlet area?
Clean the fins. Reduce the
air resistance.
Thermal/wind load has
increased.
Have structural / usage
modifications been made?
Reduce the thermal/wind
loads by taking appro-
priate measures.
No heat output possible.
Is the outdoor unit's fan
working?
Check the fan / winter fan
speed control.
Leaking cooling cycle
Are there signs of severe
frost on the large shut-of
f
valve?
Repair by specialist firm.
The compressor's
suction pipe and / or
liquid separator
have iced up
Thermal load has
increased
Is the outdoor unit in per-
manent operating mode?
Reduce the thermal load.
If necessary
, install an
additional unit / insulate
components that have iced
up
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