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14 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. 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 voltage and if neces-
sary wait until turned on
again.
Defective mains fuse/main
switch turned of
f
Are all lighting circuits func-
tioning correctly?
Replace the mains fuse.
Close main circuit breaker
Damaged power supply Does all other electrical
equipment function cor-
rectly?
Repair by specialist firm
Wait time after switching on
is 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?
Take into account the tem-
perature range for the
indoor unit and outdoor unit
Electrical surges caused by
thunderstorms
Have there been lightning
strikes in the area recently?
Switch off the mains
breaker and switch it back
on. Have it inspected by a
specialist
Malfunction of the external
condensate pump
Has the pump shut down
due to a malfunction?
Check and if necessary
clean the pump
Heating mode: Minimum
heat exchanger tempera-
ture not reached
Is the unit in the warm-up or
cool-down phase (see "Mal-
function indicated by
flashing code")?
Check or increase the inlet
temperature
The unit does not
respond to the
remote control
Transmission distance too
far/receiver af
fected by
interference
Does the indoor unit beep
when pressing a key?
Reduce the distance to less
than 6 m or change position
Remote control is faulty Is the unit running in
manual mode?
Replace the remote control
Receiver or transmitter unit
exposed to excessive solar
radiation
Does it function correctly in
the shade?
Place the receiver and/or
transmitter unit in the shade
Electromagnetic fields are
interfering with 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 dis-
play?
Release the key/only press
one key
Batteries in remote control
are flat
Have new batteries been
inserted? Is the display
incomplete?
Insert new batteries
REMKO KWD
42
42


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