Malfunction Possible causes Checks Remedial measures
The unit is run-
ning but only pro-
vides reduced or
no cooling or
heating capacity
Valve assembly jammed,
not working, not yet fully
activated
Is electrical power present
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 the filters
Windows and doors open.
Heating/cooling load has
increased
Have structural/usage mod-
ifications been made?
Close windows and doors/
install additional units
Cooling mode is not set Does the "cooling" symbol
appear on the display?
Correct the settings for the
unit
Inlet temperature in cooling
mode too high
Is the inlet temperature
approx. + 5 - + 10 °C and is
the circulation pump
working?
Reduce inlet temperature
Inlet temperature in heating
mode too low
Is the inlet temperature
approx. + 24 - + 45 °C and
is the circulation pump
working?
Increase inlet temperature.
Condensate dis-
charge on unit
Drainage pipe on collection
container clogged/damaged
Can the condensate drain
of
f without any obstruction?
Clean the drainage pipe
and collection container
Faulty external condensate
pump or float
Is the collection tray full of
water and the pump not
running?
Call out a specialist to
replace the pump
Condensate has not
drained away and has col-
lected in the condensate
drainage line
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 does not drain
of
f
Are the condensate
drainage lines unblocked
and is there a steady
incline? Are the condensate
pump and liquid level switch
functioning correctly?
Route the condensate
drainage line with an incline
and clean it. Replace the
faulty liquid level switch or
condensate pump.
Float is stuck or jammed
due to excessive dirt
Are the LEDs on the
receiver unit of the indoor
unit flashing?
Should be cleaned by spe-
cialist firm
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