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 specialist firm.
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
alarm.
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
output.
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 unit's settings.
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 non-discharged
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.
Malfunction
REMKO KWK / KWK-ZW
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