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11
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
Power failure, under-
voltage
Defective mains fuse/main
switch turned off
Damaged power supply
The unit does not
start or switches
Malfunction of the external
itself off
condensate pump
Regulation not activated
Electrical surges caused by
thunderstorms
Valve assembly jammed,
not working, not yet fully
activated
Filter is dirty/air inlet/outlet
opening is blocked by
debris
Windows and doors open.
The unit is run-
Heating/cooling load has
ning but only pro-
increased
vides reduced or
Cooling mode is not set
no cooling or
heating capacity
Medium temperature in
cooling mode too high
Medium temperature in
heating mode too low
Checks
Does all other electrical
equipment function cor-
rectly?
Are all lighting circuits func-
tioning correctly?
Does all other electrical
equipment function cor-
rectly?
Has the pump shut down
due to a malfunction?
Has the operating mode /
controller been correctly
set?
Have there been lightning
strikes in the area recently?
Is electrical power present
at the valve head or has the
time period of 3 minutes
after activation passed?
Have the filters been
cleaned?
Have structural/usage mod-
ifications been made?
Does the "cooling" symbol
appear on the display?
Is the inlet temperature
approx. + 5 - + 10 °C and is
the circulation pump
working?
Is the inlet temperature
approx. + 24 - + 45 °C and
is the circulation pump
working?
Remedial measures
Check voltage and if neces-
sary wait until turned on
again
Replace the mains fuse.
Close main circuit breaker
Repair by specialist firm
Check the pump and clean
it if necessary
Check the setting and oper-
ation
Switch off the mains
breaker and switch it back
on. Have it inspected by a
specialist
Have the valve head
replaced or wait for time
period to pass
Clean the filters
Close windows and doors/
install additional units
Correct the settings for the
unit
Reduce the medium tem-
perature
Increase the medium tem-
perature
29
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