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!
Malfunction
Possible cause
Checks
Remedial measures
The unit does not
start or switches
itself off.
Power failure, low voltage,
main fuse defective / main
switch turned off.
Does all other electrical
equipment function correctly?
Check the voltage and if necessary
wait for it to come back on.
Power supply cable damaged.
Does all other electrical
equipment function correctly?
Repair by certified service centre.
Power surge due to
thunderstorm.
Have there been lightning
strikes in the area recently?
Switch off the mains breaker and
switch it back on.
Inspection by certified service
centre.
External condensate pump
malfunction.
Has the pump shut down due
to a malfunction?
Check and clean the pump if
necessary.
Controller not activated
Has the operating mode/
controller been correctly set?
Check the setting and operation.
The unit is running but
only provides reduced
or no cooling or heating
capacity.
Valve assembly jammed,
not working, not yet fully
activated.
Is there any electrical power
at the valve head or has the
time period of 3 minutes after
activation passed?
Have the valve head replaced or
wait for time period to pass.
Filter is dirty / air inlet / outlet
opening is blocked by debris.
Have the filters been cleaned?
Clean filters.
Windows and doors open.
Heating/cooling output has
increased.
Have structural /
usage modifications
been made?
Close windows and doors / install
additional systems.
Cooling mode is not set.
Is the cooling symbol in the
chiller / heat pump display
activated?
Correct the settings for the unit.
Medium temperature in
cooling mode too high.
Is the inlet temperature
approx. + 5 ...+ 10 °C and is
the circulation pump working?
Reduce the medium temperature.
Medium temperature in
heating mode too low.
Is the inlet temperature
approx. + 25 ...+ 45 °C and is
the circulation pump working?
Increase the medium temperature.
Condensate discharge
on unit.
Drain pipe of collector reservoir
blocked / damaged.
Can the condensate drain off
without any obstruction?
Clean the drainage pipe and
collection container.
Insulation missing from
components carrying the
medium.
Do all the medium-carrying
components outside the drip
area have vapour diffusion
barrier insulation?
Have vapour diffusion barrier
insulation properly installed.
The condensate drainage line
still contains condensate.
Is there an incline on the
condensate drainage line and
is it clear?
Route the condensate drainage line
with an incline and clean it.
Condensate cannot drain /
external condensate pump or
float defective.
Are the condensate drainage
lines clear and is there an
incline? Are the condensate
pump and liquid level switch
functioning correctly?
Route the condensate drainage line
with an incline and clean it. If the
liquid level switch or the condensate
pump is defective, have them
replaced by a specialist company.
Medium outlets on the
unit.
Medium cycle / bleeding valve
leaking
Can any leaks be seen on
components carrying medium?
Have leaks sealed by a specialist
company.
Operational malfunctions
9
Summary of Contents for KWK 100-4R
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