9
Troubleshooting and customer service
The unit has been manufactured using state-of-the-art production methods and has been tested several
times to ensure that it works properly. If malfunctions should occur, please check the unit as detailed in the
list below. Please inform your dealer if the unit is still not working correctly after all the function checks have
been performed.
Operational malfunctions
Fault description
Cause
Remedy
The unit does not start or switches
itself off.
Master switch off.
Switch on the master switch.
Power failure
Check voltage and if neces-
sary wait until turned on again
Defective mains fuse
Arrange to have exchanged
Power supply defective
Repair by specialist firm.
Operational temperature range too
low or exceeded.
Observe operational tempera-
ture range 16 to 35 °C.
Internal reservoir full.
Empty reservoir.
The ambient temperature of the
unit lies outside the operating
range (16 to 35 °C).
Do not operate the unit outside
the operating range.
The unit does not work or works at
reduced cooling capacity.
Exhaust air hose kinked, extended,
routed downwards or blocked.
Ensure that there is a clear
path for the exhaust air.
Filter contamination, inlet and/or
outlet blower openings blocked by
foreign bodies.
Clean filter.
Minimum clearances too small.
Observe minimum clearances.
Windows and doors open/heat load
was increased.
Close doors and windows/
reduce heat load.
Negative pressure in the installa-
tion room whilst the unit is oper-
ating with wall pass-through.
Balance out pressure in the
installation room.
"Cooling" operating mode is not
selected.
Set "Cooling" operating mode.
Unit will be switched by means of
the timer function.
Press "I/0" key again.
Temperature setting too high.
Reduce temperature.
Overvoltage due to local lightning
strike.
Switch unit off and separate
from the power supply for 5
mins., then start anew.
The unit does not respond to the
infra-red remote control.
Batteries in the remote control are
empty or the distance to the
receiver is too great.
Insert new batteries/reduce
distance.
After battery exchange, incorrect
polarity of batteries.
Insert the batteries with the
correct polarity. Observe
marking.
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Содержание MKT 255 ECO S-Line
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